The University of Southampton
Telephone:
+442380598367
Email:
C.Littlejohns@soton.ac.uk

Dr Callum Littlejohns PhD

Personal homepage

Dr Callum Littlejohns is a Principal Enterprise Fellow and CORNERSTONE Co-Ordinator (www.cornerstone.sotonfab.co.uk)

Dr Callum Littlejohns is the coordinator of the CORNERSTONE programme, a Silicon Photonics rapid prototyping fabrication service. He completed his PhD in the field of Silicon Photonics at the Optoelectronics Research Centre, University of Southampton in March 2015, having previously obtained a First-Class Honours degree in Electronic Engineering at the University of Surrey.

He is the Principle Investigator on an Enterpise project with University of Bristol and an EU project with Luceda Photonics.

He has a track record of excellence, having received multiple awards throughout his academic life, including the Information Overload category winner at the 2015 EPSRC ICT Pioneers Awards. Callum has published a book chapter, over 30 papers in peer-reviewed journals, and over 100 international conference papers, including a prestigious post-deadline paper at the 2014 IEEE Group IV Photonics conference.

The work completed during Callum’s PhD has been protected by two separate patents, both fully supported by the University of Southampton.

Research

Research interests

EP/L021129/1 - CORNERSTONE: Capability for OptoelectRoNics, mEtamateRialS, nanoTechnOlogy aNd sEnsing

NRF2012_CRP002_062 - A cutting-edge silicon based Mid-IR photonics platform for emerging communication and sensing applications

EP/K02423X/1 - HERMES: High dEnsity Silicon GeRManium intEgrated photonicS

Teaching

Dr Callum Littlejohns teaches part of the OPTO6007 Introduction to Silicon Photonics Masters course, specialising in active Silicon Photonics devices and fabrication techniques.

Publications

Nedeljković, Miloš, Stanković, Stevan, Mitchell, Colin J., Khokhar, Ali Z., Reynolds, Scott, Thomson, David J., Gardes, Frederic Y., Littlejohns, Callum, Reed, Graham T. and Mashanovich, Goran Z. (2014) Mid-infrared thermo-optic modulators in SoI. IEEE Photonics Technology Letters, 26 (13), 1352-1355. (doi:10.1109/LPT.2014.2323702).

Reed, G.T., Mashanovich, G.Z., Gardes, F.Y., Thomson, D.J., Hu, Youfang, Soler Penadés, J., Nedeljković, M., Khokhar, A.Z., Thomas, P., Littlejohns, Callum, Ahmad, A., Reynolds, Scott, Topley, Robert, Mitchell, C.J., Stanković, S., Owens, N., Chen, Xia, Wilson, P.R., Ke, L., Ben Masaud, T., Tarazona, A. and Chong, H.M.H. (2014) Recent results in silicon photonics at the University of Southampton. Eldada, Louay A. and Lee, El-Hang (eds.) Photonics West 2014, United States. 01 - 06 Feb 2014. 89890D . (doi:10.1117/12.2045490).

Littlejohns, Callum, Hu, Youfang, Gardes, Frederic Y., Thomson, David J., Reynolds, Scott, Mashanovich, Goran Z. and Reed, Graham T. (2014) 50 Gb/s silicon photonics receiver with low insertion loss. IEEE Photonics Technology Letters, 26 (7), 714-717. (doi:10.1109/LPT.2014.2303578).

Hu, Youfang, Littlejohns, Callum G., Soler Penadés, Jordi, Khokhar, Ali Z., Stanković, Stevan, Reynolds, Scott A., Mitchell, Colin J., Gardes, Frederic Y. and Thomson, David J. (2014) Multichannel silicon photonic devices based on angled multimode interferometers. Photonics North 2014, Canada. 28 - 30 May 2014. 1 pp .

Gardes, F.Y., Littlejohns, C.G., Soler Penadés, Jordi, Mitchell, C.J., Khokhar, A.Z., Reed, G.T. and Mashanovich, G.Z. (2014) Germanium for photonic applications. ISTDM 2014: 7th International Silicon-Germanium Technology and Device Meeting, Singapore. 01 - 03 Jun 2014. (doi:10.1109/ISTDM.2014.6874667).

Gardes, F.Y., Domínguez Bucio, Thalía, Littlejohns, C.G., Reed, G.T., Debnath, K. and O'Faolain, L. (2014) Group IV functionalization of low index waveguides. Photonics North 2014, Canada. 28 - 30 May 2014.

Littlejohns, Callum, Nedeljković, Miloš, Mallinson, Christopher F., Watts, John F., Mashanovich, Goran Z., Reed, Graham T. and Gardes, Frederic Y. (2015) Next generation device grade silicon-germanium on insulator. Scientific Reports, 5, 8288. (doi:10.1038/srep08288).

Littlejohns, Callum, Gardes, Frederic Y., Nedeljković, Miloš, Mashanovich, Goran Z. and Reed, Graham T. (2014) Silicon diffusion engineering in rapid melt growth of silicon-germanium on insulator. ECS Transactions, 64 (6), 155-157. (doi:10.1149/06406.0155ecst).

Littlejohns, Callum, Nedeljković, Miloš, Mashanovich, Goran Z., Reed, Graham T. and Gardes, Frederic Y. (2014) Silicon-germanium composition engineering for next generation multilayer devices and systems. Group IV Photonics (GFP), 2014 IEEE 11th International Conference on, Paris, France. 26 - 28 Aug 2014. 2 pp . (doi:10.1109/Group4.2014.6962055).

Littlejohns, Callum George (2015) Silicon-germanium for photonic applications. University of Southampton, Physical Sciences and Engineering, Doctoral Thesis, 229pp.

Littlejohns, C.G., Khokhar, A.Z., Thomson, D.J., Hu, Y., Basset, L., Reynolds, Scott, Mashanovich, G.Z., Reed, G.T. and Gardes, F.Y. (2015) Ge-on-Si plasma enhanced chemical vapor deposition for low cost photodetectors. IEEE Photonics Journal, 7 (4), 1-8. (doi:10.1109/JPHOT.2015.2456069).

Reed, G.T., Mashanovich, G.Z., Gardes, F.Y., Thomson, David, Hu, Y., Soler Penadés, J., Nedeljković, M., Khokhar, Ali, Thomas, P., Littlejohns, Callum, Ahmad, A., Reynolds, Scott, Topley, R., Mitchell, C., Stanković, S., Chen, X., Wilson, P.R., Ke, L., Ben Masaud, T.M., Tarazona, A. and Chong, Harold (2014) Silicon photonics. 7th International Silicon-Germanium Technology and Device Meeting, Singapore, Singapore. 01 - 03 Jun 2014.

Reed, G.T., Hu, Youfang, Mashanovich, G.Z., Gardes, F.Y., Thomson, D.J., Soler Penadés, J., Nedeljković, M., Khokhar, Ali, Thomas, P., Littlejohns, C.J., Ahmad, A., Reynolds, Scott, Topley, R., Mitchell, C., Stanković, S., Richardson, D.J., Petropoulos, P., Wilson, P.R., Ke, L., Ben Masaud, T.M., Tarazona, A. and Chong, Harold (2014) Near infrared and the mid infrared silicon photonic devices. Nano Korea '14 Symposium, Seoul, South Korea. 01 - 03 Jul 2014.

Reed, G.T., Mashanovich, G.Z., Gardes, F.Y., Thomson, D.J., Hu, Youfang, Soler Penadés, J., Nedeljković, M., Khokhar, A.Z., Thomas, P., Littlejohns, C., Ahmed, A., Reynolds, Scott, Topley, R.P., Mitchell, C., Stanković, S., Wilson, P.R., Ke, L., Ben Masaud, T.M., Tarazona, A. and Chong, H.M.H. (2014) Silicon photonic devices for the near- and mid-infrared wavelength ranges. Third Mediterranean Photonics Conference, Italy. 07 - 09 May 2014.

Mashanovich, G.Z., Nedeljković, M., Soler Penadés, J., Mitchell, C.J., Khokhar, A.Z., Littlejohns, C.J., Stanković, S., Troia, B., Wang, Y., Reynolds, Scott, Passaro, V.M.N., Shen, L., Healy, N., Peacock, A.C., Alonso-Ramos, C., Ortega-Moñux, A., Wanguemert-Perez, G., Molina-Fernandez, I., Rowe, David, Wilkinson, J.S., Cheben, P., Ackert, J.J., Knights, A.P., Thomson, D.J. and Gardes, F.Y. (2015) Mid-IR group IV photonics. SPIE Photonics West '15, United States. 07 - 12 Feb 2015.

Nedeljković, M., Soler Penadés, J., Mitchell, C.J., Stanković, S., Domínguez Bucio, Thalía, Littlejohns, C.G., Gardes, F.Y. and Mashanovich, G.Z. (2015) Grating coupled low loss Ge-on-Si waveguides and multimode interferometers for the mid-infrared. Optical Fiber Communication Conference 2015, United States. 22 - 26 Mar 2015. (doi:10.1364/OFC.2015.W4A.3).

Nedeljković, Miloš, Soler Penadés, Jordi, Mitchell, Colin J., Khokhar, Ali Z., Stanković, Stevan, Domínguez Bucio, Thalía, Littlejohns, Callum, Gardes, Frederic Y. and Mashanovich, Goran Z. (2015) Surface-grating-coupled low-loss Ge-on-Si rib waveguides and multimode interferometers. IEEE Photonics Technology Letters, 27 (10), 1040-1043, [7045441]. (doi:10.1109/LPT.2015.2405611).

Mashanovich, G.Z., Nedeljković, M., Soler Penadés, J., Mitchell, C.J., Khokhar, A.Z., Littlejohns, C.J., Stanković, S., Troia, B., Wang, Y., Reynolds, Scott, Passaro, V.M.N., Shen, Li, Healy, N., Peacock, A.C., Alonso-Ramos, C., Ortega-Moñux, A., Wanguemert-Perez, G., Molina-Fernandez, I., Rowe, D.J., Wilkinson, J.S., Cheben, P., Ackert, J.J., Knights, A.P., Thomson, D.J. and Gardes, F.Y. (2015) Group IV mid-infrared photonics. SPIE Conference on Silicon Photonics X, San Francisco, United States. 09 - 12 Feb 2015.

Littlejohns, Callum, Domínguez Bucio, Thalía, Nedeljković, Miloš, Wang, Hong, Mashanovich, Goran, Reed, Graham and Gardes, Frederic (2016) Towards a fully functional integrated photonic-electronic platform via a single SiGe growth step. Scientific Reports, 6 (19425), 1-6, [19425]. (doi:10.1038/srep19425).

Littlejohns, Callum, Mohamed, Said Rouifed, Qiu, Haodong, Guo Xin, Tina, Hu, Ting, Domínguez Bucio, Thalía, Nedeljković, Miloš, Mashanovich, Goran, Reed, Graham, Gardes, Frederic and Wang, Hong (2016) Near- and mid- infrared group IV photonics. Energy Materials and Nanotechnology Quantum Meeting, Thailand. 07 - 10 Apr 2016. 1 pp .

Thomson, David J., Littlejohns, Callum, Stanković, Stevan, Nedeljković, Miloš and Reynolds, Scott (2015) Silicon photonics. In, Wiley Encyclopedia of Electrical and Electronics Engineering. Wiley Online, pp. 1-22. (doi:10.1002/047134608X.W8287).

Littlejohns, Callum, Domínguez Bucio, Thalía, Nedeljković, Miloš, Mashanovich, Goran, Reed, Graham and Gardes, Frederic (2016) Localised tuneable composition single crystal silicon-germanium-on-insulator for low cost devices. Advances in Materials Science and Engineering, 2016 (4154256), 1-11, [4154256]. (doi:10.1155/2016/4154256).

Hu, Ting, Rouifed, Mohamed Said, Qiu, Haodong, Guo, Xin, Littlejohns, Callum, Liu, Chongyong and Wang, Hong (2016) A polarization splitter and rotator based on a partially etched grating-assisted coupler. IEEE Photonics Technology Letters, 28 (8), 911-914. (doi:10.1109/LPT.2016.2517196).

Hu, Ting, Qiu, Haodong, Zhang, Zecen, Guo, Xin, Liu, Chongyang, Rouifed, Mohamed Said, Littlejohns, Callum, Reed, Graham and Wang, Hong (2016) A compact ultrabroadband polarization beam splitter utilizing a hybrid plasmonic Y-branch. IEEE Photonics Journal, 8 (4), 1-10, [4802209]. (doi:10.1109/JPHOT.2016.2585113).

Mashanovich, Goran, Mitchell, Colin, Soler Penadés, Jordi, Khokhar, Ali, Littlejohns, Callum, Cao, Wei, Qu, Zhibo, Stanković, Stevan, Gardes, Frederic, Ben Masaud, Taha, Chong, Harold, Mittal, Vinita, Murugan, Ganapathy Senthil, Wilkinson, James, Peacock, Anna and Nedeljković, Miloš (2017) Germanium mid-infrared photonic devices. Journal of Lightwave Technology, 35 (4), 624-630. (doi:10.1109/JLT.2016.2632301).

Alonso-Ramos, Carlos, Nedeljković, Miloš, Benediković, Daniel, Soler Penadés, Jordi, Littlejohns, Callum, Khokhar, Ali, Perez-Galacho, Diego, Vivien, Laurent, Cheben, Pavel and Mashanovich, Goran (2016) Germanium-on-silicon mid-infrared grating couplers with low-reflectivity inverse taper excitation. Optics Letters, 41 (18), 4324-4327. (doi:10.1364/OL.41.004324).

Rouifed, Mohamed Said, Littlejohns, Callum, Guo Xin, Tina, Qiu, Haodong, Soler Penadés, Jordi, Nedeljković, Miloš, Zhang, Zecen, Liu, Chongyong, Thomson, David, Mashanovich, Goran, Reed, Graham and Wang, Hong (2017) Ultra-compact MMI-based beam splitter demultiplexer for the NIR/MIR wavelengths of 1.55 μm and 2 μm. Optics Express, 25 (10), 10893-10900. (doi:10.1364/OE.25.010893).

Mastronardi, Lorenzo, Banakar, Mehdi, Khokhar, Ali, Domínguez Bucio, Thalía, Littlejohns, Callum, Mashanovich, Goran and Gardes, Frederic (2017) SiGe Bandgap Tuning for High Speed Eam. ECS Transactions, 77 (6), 59-63. (doi:10.1149/07706.0059ecst).

Mastronardi, L., Banakar, M., Khokhar, A.Z., Domínguez Bucio, Thalía, Littlejohns, Callum, Bernier, N., Robin, E., Rouviere, C., Dansas, H., Gambacorti, N., Mashanovich, G.Z. and Gardes, F.Y. (2017) SiGe bandgap tuning for high speed Eam. 231st ECS Meeting, United States. 28 May - 01 Jun 2017. 5 pp . (In Press)

Thomson, D.J., Littlejohns, Callum, Li, K., Nedeljković, M., Khokhar, A.Z., Gardes, F.Y., Mashanovich, G.Z., Lacava, C., Petropoulos, P., Richardson, D.J., Rouifed, M.S., Qiu, H., Xin, T.G., Hu, T., Zhang, Z., Wang, H., Chiu, P.-W., Li, Y.-F., Hsu, S.H. and Reed, G.T. (2016) Integrated silicon optical modulators. In 2016 Progress in Electromagnetic Research Symposium (PIERS). IEEE. 1 pp . (doi:10.1109/PIERS.2016.7735323).

Runge, Antoine, Franz, Yohann, Littlejohns, Callum, Grabska, Katarzyna, Monika, Mailis, Sakellaris, Gardes, Frederic and Peacock, Anna (2017) Laser-assisted material composition engineering of SiGe planar waveguides. CLEO-Pacific Rim 2017, Singapore. 31 Jul - 04 Aug 2017. 2 pp .

Mashanovich, G.Z., Gardes, F.Y., Thomson, D.J., Hu, Y., Li, K., Nedeljković, M., Soler Penadés, J., Khokhar, A.Z., Mitchell, C.J., Stanković, S., Topley, R., Reynolds, S.A., Wang, Y., Troia, B., Passaro, V.M.N., Littlejohns, C.G., Domínguez Bucio, Thalía, Wilson, P.R. and Reed, G.T. (2015) Silicon photonic waveguides and devices for near- and mid-IR applications. IEEE Journal of Selected Topics in Quantum Electronics, 21 (4), 407-418. (doi:10.1109/JSTQE.2014.2381469).

Nedeljković, Miloš, Soler Penadés, Jordi, Mittal, Vinita, Murugan, Ganapathy Senthil, Khokhar, Ali, Littlejohns, Callum, Carpenter, Lewis Glynn, Gawith, Corin, Wilkinson, James and Mashanovich, Goran (2017) Germanium-on-silicon waveguides operating at mid-infrared wavelengths up to 8.5 μm. Optics Express, 25 (22), 27431-27441. (doi:10.1364/OE.25.027431).

Mastronardi, Lorenzo, Banakar, Mehdi, Khokhar, Ali, Hattasan, Nannicha, Rutirawut, Teerapat, Domínguez Bucio, Thalía, Grabska, Katarzyna, Monika, Littlejohns, Callum, Bazin, Alexandre, Mashanovich, Goran and Gardes, Frederic (2018) High-speed Si/GeSi hetero-structure electro absorption modulator. Optics Express, 26 (6), 6663-6673. (doi:10.1364/OE.26.006663).

Soler Penadés, J., Sánchez-Postigo, A., Nedeljković, M., Ortega-Moñux, A., Wangüemert-Pérez, J. G., Xu, Y., Halir, R., Qu, Z., Khokhar, A. Z., Osman, A., Cao, W., Littlejohns, C. G., Cheben, P., Molina-Fernández, I. and Mashanovich, G.Z. (2018) Suspended silicon waveguides for long-wave infrared wavelengths. Optics Letters, 43 (4), 795-798. (doi:10.1364/OL.43.000795).

Milošević, M.M., Chen, X., Cao, W., Runge, A.F.J., Franz, Y., Littlejohns, C.G., Mailis, S., Peacock, A.C., Thomson, D.J. and Reed, G.T. (2018) Ion implantation in silicon for trimming the operating wavelength of ring resonators. IEEE Journal of Selected Topics in Quantum Electronics, 24 (4), 1-7. (doi:10.1109/JSTQE.2018.2799660).

Zhang, Zecen, Ng, Geok Ing, Hu, Ting, Qiu, Haodong, Guo, X., Wang, Wanjun, Rouifed, Mohamed Said, Liu, Chongyang, Xia, Jiaxu, Zhou, Jin, Littlejohns, Callum G., Reed, Graham T. and Wang, Hong (2018) Mid-infrared sensor based on suspended microracetrack resonator with lateral sub-wavelength-grating metamaterial cladding. IEEE Photonics Journal, 1-8. (doi:10.1109/JPHOT.2018.2809662).

Mashanovich, G.Z., Soler Penadés, J., Cao, W., Qu, Z., Osman, A., Wu, Yangbo, Khokhar, A.Z., Littlejohns, C.J., Stanković, S., Reynolds, S., Mittal, V., Murugan, G.S., Wilkinson, J.S., Qi, Y., Gardes, F.Y., Thomson, D.J. and Nedeljković, M. (2018) Group IV mid-infrared devices and circuits. In Integrated Optics: Devices, Materials, and Technologies XXII. vol. 10535, SPIE. pp. 1-6 . (doi:10.1117/12.2289531).

Debnath, Kapil, Thomson, David, Zhang, Weiwei, Khokhar, Ali, Littlejohns, Callum, Byers, James, Mastronardi, Lorenzo, Husain, Muhammad K, Ibukuro, Kouta, Gardes, Frederic, Reed, Graham and Saito, Shinichi (2018) All-silicon carrier accumulation modulator based on a lateral MOS-capacitor. Photonics Research, 6 (5), 373-379, [318121]. (doi:10.1364/PRJ.6.000373).

Debnath, Kapil, Thomson, David, Zhang, Weiwei, Khokhar, Ali, Littlejohns, Callum, Byers, James, Mastronardi, Lorenzo, Husain, Muhammad K., Gardes, Frederic, Reed, Graham and Saito, Shinichi (2018) 20Gbps silicon lateral MOS-Capacitor electro-optic modulator. In CLEO: Science and Innovations, San Jose CA, 13-18 May 2018. OSA. pp. 1-2 . (doi:10.1364/CLEO_SI.2018.SM3B.5).

Mashanovich, G.Z., Nedeljković, M., Soler-Penadés, J., Qu, Z., Cao, W., Osman, A., Wu, Y., Stirling, C.J., Qi, Y., Xu-Cheng, Y., Reid, L., Littlejohns, C.G., Kang, J., Zhao, Z., Takenaka, M., Li, T., Zhou, Z., Gardes, F.Y., Thomson, D.J. and Reed, G.T. (2018) Group IV mid-infrared photonics [Invited]. Optical Materials Express, 8 (8), 2276-2286. (doi:10.1364/OME.8.002276).

Littlejohns, Callum G., Nedeljković, Miloš, Cao, Wei, Soler Penadés, Jordi, Hagan, David, Ackert, Jason J., Rouifed, Mohamed Saïd, Wang, Wanjun, Zhang, Zecen, Qiu, Haodong, Guo Xin, Tina, Knights, Andrew P., Reed, Graham T., Mashanovich, Goran Z., Wang, Hong and Thomson, David J. (2018) All silicon approach to modulation and detection at λ = 2 μm. In Optical Interconnects XVIII. vol. 10538, SPIE.. (doi:10.1117/12.2288951).

Zhang, Zecen, Ng, Geok Ing, Hu, Ting, Qiu, Haodong, Guo, X., Wang, Wanjun, Rouifed, Mohamed Said, Liu, Chongyang, Xia, Jiaxu, Zhou, Jin, Littlejohns, Callum G., Nedeljković, Miloš, Reed, Graham T. and Wang, Hong (2018) Experimental demonstration of thermally tunable fano and EIT resonances in coupled resonant system on SOI platform. IEEE Photonics Journal, 10 (3), 1-8. (doi:10.1109/JPHOT.2018.2839621).

Thomson, David, Gardes, Frederic, Debnath, Kapil, Zhang, Weiwei, Li, Ke, Liu, Shenghao, Meng, Fanfan, Khokhar, Ali, Littlejohns, Callum, Byers, James, Mastronardi, Lorenzo, Husain, Muhammad, Saito, Shinichi, Chen, Xia, Milošević, Milan, Franz, Yohann, Runge, Antoine F.J., Mailis, Sakellaris, Peacock, Anna, Wilson, Peter and Reed, Graham (2018) Towards high speed and low power silicon photonic data links. In 20th International Conference on Transparent Optical Networks (ICTON). IEEE. 4 pp . (doi:10.1109/ICTON.2018.8473598).

Mastronardi, Lorenzo, Banakar, Mehdi, Khokhar, Ali, Hattasan, Nannicha, Rutirawut, Teerapat, Domínguez Bucio, Thalía, Grabska, Katarzyna, Monika, Littlejohns, Callum, Bazin, Alexandre, Mashanovich, Goran and Gardes, Frederic (2018) 56 Gbps GeSi Franz-Keldysh modulator for silicon photonic transceivers. D-photon 2018: 1st International Conference on Dielectric Photonic Devices and Systems Beyond Visible. 01 - 02 Oct 2018. 2 pp .

Mastronardi, Lorenzo, Banakar, Mehdi, Khokhar, Ali, Hattasan, Nannicha, Rutirawut, Teerapat, Domínguez Bucio, Thalía, Grabska, Katarzyna, Monika, Littlejohns, Callum, Bazin, Alexandre, Mashanovich, Goran and Gardes, Frederic (2018) 56 Gb/s Si/GeSi optical modulator. CLEO - Pacific Rim 2018, China. 28 Jul - 03 Aug 2018. 2 pp .

Wang, Wanjun, Zhang, Zecen, Guo, Xin, Zhou, Jin, Brian, Sia Jia Xu, Rouifed, Mohamed S., Liu, Chongyang, Littlejohns, Callum, Reed, Graham T. and Wang, Hong (2018) Mid-infrared (MIR) Mach-Zehnder silicon modulator at 2μm wavelength based on interleaved PN junction. In 2018 Conference on Lasers and Electro-Optics, CLEO 2018 - Proceedings: Science and Innovations, CLEO_SI 2018. OSA.. (doi:10.1364/CLEO_SI.2018.STh1B.1).

Mastronardi, Lorenzo, Banakar, Mehdi, Khokhar, Ali, Hattasan, Nannicha, Rutirawut, Teerapat, Domínguez Bucio, Thalía, Grabska, Katarzyna, Monika, Littlejohns, Callum, Bazin, Alexandre, Mashanovich, Goran and Gardes, Frederic (2018) 56 Gbps Si/GeSi integrated EAM. Proceedings of SPIE, 10823, 1-10, [10823D]. (doi:10.1117/12.2502709).

Cao, Wei, Hagan, David, Thomson, David J., Nedeljković, Miloš, Littlejohns, Callum G., Knights, Andy, Alam, Shaif Ul, Wang, Junjia, Gardes, Frederic, Zhang, Weiwei, Liu, Shenghao, Li, Ke, Rouifed, Mohamed Said, Xin, Guo, Wang, Wanjun, Wang, Hong, Reed, Graham T. and Mashanovich, Goran Z. (2018) High-speed silicon modulators for the 2 μm wavelength band. Optica, 5 (9), 1055-1062. (doi:10.1364/OPTICA.5.001055).

Cao, W., Nedeljković, M., Littlejohns, C.G., Li, T., Zhou, Z., Gardes, F.Y., Thomson, D.J., Reed, G.T. and Mashanovich, G.Z. (2018) Silicon and germanium mid-infrared optical modulators. In IEEE Photonics Society Summer Topicals Meeting Series, SUM 2018. IEEE. pp. 209-210 . (doi:10.1109/PHOSST.2018.8456777).

Cao, W., Thomson, D.J., Nedeljković, M., Alam, S.U., Wang, Junjia, Gardes, F., Reed, G.T., Mashanovich, G.Z., Littlejohns, C.G. and Rouifed, M.S. (2018) 20-Gb/s silicon optical modulators for the 2 μm wavelength band. In 2018 IEEE 15th International Conference on Group IV Photonics (GFP). IEEE. pp. 1-2 . (doi:10.1109/GROUP4.2018.8478691).

Li, Tiantian, Nedeljković, Miloš, Hattasan, Nannicha, Khokhar, Ali Z., Reynolds, Scott A., Stanković, Stevan, Banakar, Mehdi, Cao, Wei, Qu, Zhibo, Littlejohns, Callum G., Soler Penadés, Jordi, Grabska, Katarzyina, Mastronardi, Lorenzo, Thomson, David J., Gardes, Frederic Y., Reed, Graham T., Wu, Hequan, Zhou, Zhiping and Mashanovich, Goran Z. (2017) Mid-infrared Ge-on-Si electro-absorption modulator. In 2017 IEEE 14th International Conference on Group IV Photonics (GFP). IEEE. pp. 7-8 . (doi:10.1109/GROUP4.2017.8082169).

Reed, Graham T., Chen, Xia, Milošević, Milan M., Cao, Wei, Littlejohns, Callum, Khokhar, Ali Z., Franz, Yohann, Runge, Antoine F.J., Mailis, Sakellaris, Thomson, David J. and Peacock, Anna C. (2018) Advancing silicon photonics by germanium ion implantation into silicon. In Smart Photonic and Optoelectronic Integrated Circuits XX. vol. 10536, SPIE.. (doi:10.1117/12.2292199).

Gardes, Frederic, Domínguez Bucio, Thalía, Mastronardi, Lorenzo, Banakar, Mehdi, Bazin, Alexandre, Khokhar, Ali, Lacava, Cosimo, Petropoulos, Periklis, Littlejohns, Callum and Debnath, Kapil (2018) Group IV compounds modulators and mid index waveguides for enhanced CMOS photonics. In 31st Annual Conference of the IEEE Photonics Society, IPC 2018. IEEE. 2 pp . (doi:10.1109/IPCon.2018.8527257).

Nedeljković, M., Littlejohns, C.G., Khokhar, A.Z., Banakar, M., Cao, W., Soler Penadés, J., Tran, D.T., Gardes, F.Y., Thomson, D.J., Reed, G.T., Wang, H. and Mashanovich, G.Z. (2019) Silicon-on-insulator free-carrier injection modulators for the mid-infrared. Optics Letters, 44 (4), 915-918. (doi:10.1364/OL.44.000915).

Du, H., Zhang, W., Littlejohns, C.G., Stanković, S., Yan, X., Tran, D.T., Sharp, G. J., Gardes, F.Y., Thomson, D.J., Sorel, M., Mashanovich, G.Z. and Reed, G.T. (2019) Ultra-sharp asymmetric Fano-like resonance spectrum on Si photonic platform. Optics Express, 27 (5), 7365-7372. (doi:10.1364/OE.27.007365).

Sánchez-Postigo, Alejandro, Wangüemert-Pérez, Juan Gonzalo, Soler Penadés, Jordi, Ortega-Moñux, Alejandro, Nedeljković, Miloš, Halir, Robert, El Mokhtari Mimun, Faysal, Cheng, Yolanda Xu, Qu, Zhibo, Khokhar, Ali Z., Osman, Ahmed, Cao, Wei, Littlejohns, Callum G., Cheben, Pavel, Mashanovich, Goran Z. and Molina-Fernández, Íñigo (2019) Mid-infrared suspended waveguide platform and building blocks. IET Optoelectronics, 13 (2), 55-61. (doi:10.1049/iet-opt.2018.5067).

Soler Penadés, J., Hu, Youfang, Nedeljković, Miloš, Littlejohns, Callum G., Khokhar, Ali Z., Mitchell, Colin J., Stanković, Stevan, Roelkens, Gunther, Gardes, Frederic Y. and Mashanovich, Goran Z. (2015) Angled MMI CWDM structure on germanium on silicon. In Proceedings 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015. Optical Society of America..

Mastronardi, L., Banakar, M., Khokhar, A.Z., Hattasan, N., Rutirawut, T., Domínguez Bucio, T., Grabska, K.M., Littlejohns, C., Bazin, A., Mashanovich, G. and Gardes, F.Y. (2019) 56 Gb/s GeSi optical modulator. In 2018 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR 2018). IEEE..

Li, Tiantian, Nedeljković, Miloš, Hattasan, Nannicha, Cao, Wei, Qu, Zhibo, Littlejohns, Callum, Soler Penadés, Jordi, Mastronardi, Lorenzo, Mittal, Vinita, Benedikovic, Daniel, Thomson, David J., Gardes, Frederic Y., Wu, Hequan, Zhou, Zhiping and Mashanovich, Goran (2019) Ge-on-Si modulators operating at mid-infrared wavelengths up to 8 μm. Photonics Research, 7 (8), 828-836. (doi:10.1364/PRJ.7.000828).

Rahim, Abdul, Goyvaerts, Jeroen, Szelag, Bertrand, Fédéli, Jean Marc, Absil, Philippe, Aalto, Timo, Harjanne, Mikko, Littlejohns, Callum G., Reed, Graham T., Winzer, Georg, Lischke, Stefan, Lars, Zimmermann, Knoll, Dieter, Geuzebroek, Douwe, Leinse, Arne, Geiselmann, Michael, Zervas, Michael, Jans, Hilde, Stassen, Andim, Dominguez, Carlos, Munoz, Pascual, Domenech, David, Giesecke, Anna Lena, Lemme, Max Christian and Baets, Roel (2019) Open-access silicon photonics platforms in Europe. IEEE Journal of Selected Topics in Quantum Electronics, 25 (5), 1-18. (doi:10.1109/JSTQE.2019.2915949).

Sia, Jia Xu Brian, Wang, Wanjun, Guo, Xin, Zhou, Jin, Zhang, Zecen, Rouifed, Mohamed Said, Li, Xiang, Qiao, Zhong Liang, Liu, Chong Yang, Littlejohns, Callum, Reed, Graham T. and Wang, Hong (2019) Mid-infrared, ultra-broadband, low-loss, compact arbitrary power splitter based on adiabatic mode evolution. IEEE Photonics Journal, 11 (2), 1-12, [8688691]. (doi:10.1109/JPHOT.2019.2907788).

Brian Sia, Jia Xu, Wang, Wanjun, Qiao, Zhongliang, Li, Xiang, Guo, Xin, Zhou, Jin, Zhang, Zecen, Littlejohns, Callum, Liu, Chongyang, Reed, Graham T. and Wang, Hong (2019) Compact, ultra-tunable InGaSb/AlGaAsSb Si external cavity laser at the Mid-Infrared (MIR). In 2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings. IEEE.. (doi:10.23919/CLEO.2019.8749759).

Zhang, Weiwei, Debnath, Kapil, Chen, Bigeng, Husain, Muhammad K, Khokhar, Ali, Liu, Shenghao, Byers, James, Cao, Wei, Ebert, Martin, Reynolds, Jamie Dean, Banakar, Mehdi, Littlejohns, Callum, Reynolds, Scott, Li, Ke, Gardes, Frederic, Mashanovich, Goran, Reed, Graham, Saito, Shinichi and Thomson, David (2019) High speed silicon capacitor modulators for TM polarisation. In 2019 IEEE 16th International Conference on Group IV Photonics (GFP). IEEE.. (doi:10.1109/GROUP4.2019.8925987).

Sia, Jia Xu Brian, Reed, Graham T., Wang, Hong, Wang, Wanjun, Guo, Xin, Zhou, Jin, Zhang, Zecen, Li, Xiang, Qiao, Zhong Liang, Liu, Chong Yang and Littlejohns, Callum (2019) SiN-SOI multilayer platform for prospective applications at 2 μm. IEEE Photonics Journal, 11 (6), 1-10, [8894868]. (doi:10.1109/JPHOT.2019.2952603).

Du, H., Zhang, X., Littlejohns, C.G., Tran, D.T., Yan, X., Banakar, M., Wei, C., Thomson, D. J. and Reed, G.T. (2020) Nonconservative coupling in a passive silicon microring resonator. Physical Review Letters, 124 (1), 1-6, [013606]. (doi:10.1103/PhysRevLett.124.013606).

Sia, Jia Xu Brian, Wang, Wanjun, Qiao, Zhongliang, Li, Xiang, Guo, Xin, Zhou, Jin, Littlejohns, Callum G., Zhang, Zecen, Liu, Chongyang, Reed, Graham T. and Wang, Hong (2020) Compact silicon photonic hybrid ring external cavity (SHREC)/InGaSb-AlGaAsSb wavelength-tunable laser diode operating from 1881-1947 nm. Optics Express, 28 (4), 5134-5146. (doi:10.1364/OE.383524).

Grabska, Katarzyna, Banakar, Mehdi, Domínguez Bucio, Thalia, Nedeljković, Miloš, Littlejohns, Callum, Ballabio, Andrea, Barzaghi, Andrea, Isella, Giovanni, Saito, Shinichi and Gardes, Frederic (2019) Multi composition GeSi tuneable concentration silicon-germanium wire structures for CMOS photonics. In 2019 IEEE 16th International Conference on Group IV Photonics (GFP). IEEE. pp. 1-2 . (doi:10.1109/GROUP4.2019.8926039).

Grabska, Katarzyna, Banakar, Mehdi, Domínguez Bucio, Thalia, Nedeljković, Miloš, Barzaghi, Andrea, Ballabio, Andrea, Isella, Giovanni, Littlejohns, Callum, Saito, Shinichi and Gardes, Frederic (2019) Silicon-germanium composition tunability by application of Rapid Melt Growth (RMG) for the silicon-on-insulator platform. Photonics North, Canada. 21 - 23 May 2019.

Mallinson, C.F., Littlejohns, C.G., Gardes, F.Y., Castle, J.E. and Watts, J.F. (2015) Analysis of silicon germanium standards for the quantification of SiGe microelectronic devices using AES. Surface Science Spectra, 22 (1), 32-46. (doi:10.1116/11.20141102).

Tran, Huong, Littlejohns, Callum G., Thomson, David J., Pham, Thach, Ghetmiri, Amir, Mosleh, Aboozar, Margetis, Joe, Tolle, John, Mashanovich, Goran Z., Du, Wei, Li, Baohua, Mortazavi, Mansour and Yu, Shui-Qing (2019) Study of GeSn mid-infrared photodetectors for high frequency applications. Frontiers in Materials, 6. (doi:10.3389/fmats.2019.00278). (In Press)

Rouifed, M-Said, Littlejohns, Callum G., Guo, Tina X., Wang, Wanjun, Thomson, David J., Reed, Graham T. and Wang, Hong (2018) Electrooptic silicon-based modulator for short-wave infrared. 1st International Conference on Optics, Photonics and Lasers (OPAL). 09 - 11 May 2018.

Littlejohns, C.G., Rouifed, M.S., Qiu, H., Xin, Tina Guo, Hu, Ting, Domínguez Bucio, T., Nedeljković, M., Thomson, D.J., Khokhar, A.Z., Mashanovich, G.Z., Reed, G.T., Wang, Hong and Gardes, F.Y. (2016) Single crystal silicon-germanium-on-insulator for high density optical interconnects. Progress in Electromagnetic Research Symposium, China. 07 - 10 Aug 2016. (doi:10.1109/PIERS.2016.7735229).

Mashanovich, G.Z., Soler Penadés, J., Mittal, V., Murugan, G.S., Khokhar, A.Z., Littlejohns, C.J., Stanković, S., Ortega-Moñux, A., Wangüemert-Pérez, G., Halir, R., Molina-Fernández, I., Alonso-Ramos, C., Benedikovic, D., Villafranca, A., Cheben, P., Ackert, J.J., Knights, A.P., Wilkinson, J.S. and Nedeljković, M. (2016) Mid IR applications of Si photonics. OptoElectronics and Communications Conference (OECC 2016), Japan. 03 - 07 Jul 2016.

Milošević, Milan M., Chen, Xia, Cao, Wei, Thomson, David J., Reed, Graham T., Littlejohns, Callum G. and Wang, Hong (2017) Ion implantation in silicon for photonic device trimming. In 2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR). IEEE.. (doi:10.1109/CLEOPR.2017.8118916).

Anantha, P., Zhang, Lin, Li, Wei, Guo, Xin, Qiu, Haodong, Chong, Gang Yih, Littlejohns, Callum G., Nedeljković, Milos, Soler Penadés, Jordi, Mashanovich, Goran Z., Wang, Hong and Tan, Chuan Seng (2017) Low propagation loss Ge-on-Si waveguides and their dependency on processing methods. In 2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR). IEEE.. (doi:10.1109/CLEOPR.2017.8118738).

Reed, G.T., Nedeljković, M., Soler Penadés, J., Mitchell, C.J., Khokhar, A.Z., Littlejohns, C.J., Stanković, S., Troia, Benedetto, Passaro, V.M.N., Shen, L., Healy, N., Peacock, A.C., Ortega-Moñux, A., Wangüemert-Pérez, G., Molina-Fernández, I., Cheben, P., Ackert, J.J., Knights, A.P., Thomson, D.J., Gardes, F.Y. and Mashanovich, G.Z. (2015) Group IV mid-IR photonics. Summer Topicals Meeting Series 2015, Nassau, Bahamas. 12 - 14 Jul 2015. (doi:10.1109/PHOSST.2015.7248190).

Mashanovich, G.Z., Nedeljković, M., Soler Penadés, J., Mitchell, C.J., Khokhar, A.Z., Littlejohns, C.J., Stanković, S., Troia, B., Passaro, V.M.N., Shen, L., Healy, N., Peacock, A.C., Ortega-Moñux, A., Wangüemert-Pérez, G., Halir, R., Molina-Fernández, I., Benediković, D., Murugan, G.S., Wilkinson, J.S., Cheben, P., Villafranca, A., Ackert, J.J., Knights, A.P., Thomson, D.J., Gardes, F.Y. and Reed, G.T. (2015) Group IV photonics for the mid-infrared. In Integrated Photonics Research, Silicon and Nanophotonics 2015. Optical Society of America.. (doi:10.1364/IPRSN.2015.IT3A.2).

Rouifed, M-Said, Littlejohns, Callum G., Tina, Guo X., Sia, Jia Xu, Qiu, Haodong, Soler Penadés, Jordi, Nedeljković, Milos, Zhang, Zecen, Liu, Chongyong, Thomson, David J., Mashanovich, Goran Z., Reed, Graham T. and Wang, Hong (2017) Silicon photonic devices for the mid-infrared. In 2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR). IEEE.. (doi:10.1109/CLEOPR.2017.8119001).

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