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Dr. GAI Xin (蓋鑫博士)

B.Eng. (OptE) ZJU, Ph.D. (Phys) ANU

Assistant Professor

Contact Information

Office: G6525 YEUNG
Phone: +(852)-3442-9409
Fax: +(852)-3442-0562
Email: xingai@cityu.edu.hk
Web: Google Scholar

Research Interests

  • Mid-infrared Photonics
  • On-chip Optical Integration
  • Nonlinear Optics & Nonlinear Materials
  • Biophotonics, Medical Imaging & Spectroscopy
Dr. Xin Gai received his B.E. in Optical Engineering from Zhejiang University (ZJU), Hangzhou, China, in 2007 and obtained his PhD degree in Physics from the Australian National University (ANU), Australia, in 2013. Since then he has started his academic career as Postdoctoral Fellow at ANU and have been promoted to Research Fellow from 2015. His PhD and postdoctoral projects are closely related to Flagship Projects of Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), an Australian Research Council (ARC) Centre of Excellence (2003-2017, AUD $50M). In February 2018, Xin joined the City University of Hong Kong as an Assistant Professor at the Department of Electronic Engineering. His research interests and expertise include near & mid-infrared photonics, chalcogenide glasses, bio-photonics, nano-fabrication and nonlinear optics. He is going to apply his multidisciplinary expertise for advanced bio-sensing, medical imaging and spectroscopic diagnosis.

Currently Xin is a Chief Investigator on an ARC Linkage Project with Agilent Technologies, a collaboration towards developing a high-brightness mid-infrared supercontinuum light source for Fourier transform infrared spectroscopy for new commercialization opportunities. He used to be technical consultant of HP labs on hydrogenated amorphous silicon and nano-cavity switching for integrated optical processor. He was winner of the Chinese Government Award for Outstanding Self-financed Students Abroad, 2011, and the Annual Award for the Most Outstanding PhD Thesis in Physics, ANU, 2012-2013. Up to Feb 2018, Xin has contributed 1 book chapter, published 30 refereed journal articles and more than 20 refereed conference papers. His publications have, so far, received more than 1300 citations and Hirsh index is 19, including Nature Communication, Science Advances, Laser & Photonics Review, Advanced Optical Materials, Optics Letters, Optics Express, etc.


Award and Achievement

  • 2010 “The best student oral presentation at the COMMAD 2010” Conference on Optoelectronic and Microelectronic Materials and Device.
  • 2011 “Chinese Government Scholarship for Outstanding Self-Financed Students Studying Abroad” China Scholarship Council.
  • 2013 “The Jagadishwar Mahanty Prize to the most outstanding PhD thesis of ANU in Physics ” Australian National University. The annual award to the best PhD thesis of ANU.


Previous Experience

  • 2015 - 2017, Research Fellow, Australian National University. Laser Physics Center (CUDOS), Research School of Physics and Engineering.
  • 2013 - 2014, Postdoctoral Fellow, Australia Nation University. Laser Physics Center (CUDOS), Research School of Physics and Engineering.


Publication Show All Publications Show Prominent Publications


Journal

  • Zuo, H. , Choi, D. , Gai, X. , Luther-Davies, B. & Zhang, B. (2017). CMOS compatible fabrication of micro, nano convex silicon lens arrays by conformal chemical vapor deposition. Optics Express. 25. 3069 - 3076.
  • Guo, R. , Decker, M. , Setzpfandt, F. , Gai, X. , Choi, D. , Kiselev, R. , Chipouline, A. , Staude, I. , Pertsch, T. , Neshev, D. & Kivshar, Y. (2017). High-bit rate ultra-compact light routing with mode-selective on-chip nanoantennas. Science Advances. 3. 1700007 .
  • Zuo, H. , Choi, D. , Gai, X. , Ma, P. , Xu, L. , Neshev, D. , Zhang, B. & Luther-Davies, B. (2017). High-Efficiency All-Dielectric Metalenses for Mid-Infrared Imaging. Advanced Optical Materials. 5. 1700585 .
  • Yu, Y. , Gai, X. , Ma, P. , Vu, K. , Yang, Z. , Wang, R. , Choi, D. , Madden, S. & Luther-Davies, B. (2016). Experimental Demonstration of Stable 2-10 μm Supercontinuum Generation in a Chalcogenide Rib Waveguide. Optics Letters. 41. 958 - 961.
  • Zhang, B. , Yu, Y. , Zhai, C. , Qi, S. , Wang, Y. , Yang, A. , Gai, X. , Wang, R. , Yang, Z. & Luther-Davies, B. (2016). High Brightness 2.2–12 μm Mid-Infrared Supercontinuum Generation in a Nontoxic Chalcogenide Step-Index Fiber. J. Am. Ceram. Soc. 99. 14391 .
  • Pei, J. , Gai, X*. , Yang, J. , Wang, X. , Yu, Z. , Choi, D. , Luther-Davies, B. & Lu, Y. (2016). Producing Air-stable Monolayers of Phosphorene and their Defect Engineering. Nature Communication. 7. 10450 .
  • Yu, Y. , Zhang, B. , Gai, X. , Zhai, S. , Qi, S. , Guo, W. , Yang, Z. , Wang, R. , Choi, D. , Madden, S. & Luther-Davies, B. (2015). 1.8-10 µm Mid-infrared Supercontinuum Generated in a Step-index Chalcogenide Fiber using Low Peak Pump Power. Optics Letters. 40. 1081 - 1084.
  • Zhang, B. , Zhai, C. , Qi, S. , Guo, W. , Yang, Z. , Yang, A. , Gai, X. , Yu, Y. , Wang, R. , Tang, D. , Tao, G. & Luther-Davies, B. (2015). High-resolution chalcogenide fiber bundles for infrared imaging. Optics Letters. 40. 4384 - 4387.
  • Moller, U. , Yu, Y. , Kubat, I. , Petersen, C. , Gai, X. , Brilland, L. , Mechin, D. , Caillaud, C. , Troles, J. , Luther-Davies, B. & Bang, O. (2015). Multi-milliwatt mid-infrared supercontinuum generation in a suspended core chalcogenide fiber. Optics Express. 23. 3282 - 3291.
  • Yu, Y. , Gai, X. , Ma, P. , Choi, D. , Yang, Z. , Wang, R. , Debbarma, S. , Madden, S. & Luther-Davies, B. (2014). A stable, broadband, quasi-continuous, mid-infrared supercontinuum generated in chalcogenide glass waveguide. Laser & Photonics Reviews. 8. 792 - 798.
  • Gai, X*. , Choi, D. & Luther-Davies, B. (2014). Negligible nonlinear absorption in hydrogenated amorphous silicon at 1.55μm for ultra-fast nonlinear signal processing. Optics Express. 22. 9948 - 9958.
  • Wang, T. , Gai, X*. , Wei, W. , Wang, R. , Yang, Z. , Shen, X. , Madden, S. & Luther-Davies, B. (2014). Systematic Z-scan measurements of the third order nonlinearity of chalcogenide glasses. Optical Materials Express. 4. 1011 - 1022.
  • Vu, K. , Yan, K. , Jin, Z. , Gai, X. , Choi, D. , Debbarma, S. , Luther-Davies, B. & Madden, S. (2013). Hybrid waveguide from As2S3 and Er-doped TeO2 for lossless nonlinear optics. Optics Letters. 38. 1766 - 1768.
  • Ma, P. , Choi, D. , Yu, Y. , Gai, X. , Yang, Z. , Debbarma, S. , Madden, S. & Luther-Davies, B. (2013). Low-loss chalcogenide waveguides for chemical sensing in the mid-infrared. Optics Express. 21. 29927 - 29937.
  • Yu, Y. , Gai, X. , Wang, T. , Ma, P. , Wang, R. , Yang, Z. , Choi, D. , Madden, S. & Luther-Davies, B. (2013). Mid-infrared supercontinuum generation in chalcogenides. Optical Materials Express. 3. 1075 .
  • Gai, X. , Yu, Y. , Kuyken, B. , Ma, P. , Madden, S. , Campenhout, J. , Verheyen, P. , Roelkens, G. , Baets, R. & Luther-Davies, B. (2013). Nonlinear absorption and refraction in crystalline silicon in the mid-infrared. Laser & Photonics Reviews. 7. 1054 - 1064.
  • He, J. , Xiong, C. , Clark, A. , Collins, M. , Gai, X. , Choi, D. , Madden, S. & Luther-Davies, B. (2012). Effect of low-Raman window position on correlated photon-pair generation in a chalcogenide Ge11.5As24Se64.5 nanowire. Journal of Applied Physics. 112.
  • Gai, X*. , Wang, R. , Xiong, C. , Steel, M. , Eggleton, B. & Luther-Davies, B. (2012). Near-zero anomalous dispersion Ge11.5As24Se64.5 glass nanowires for correlated photon pair generation: design and analysis. Optics Express. 20. 776 - 786.
  • Gai, X*. , Luther-Davies, B. & White, T. (2012). Photonic crystal nanocavities fabricated from chalcogenide glass fully embedded in an index-matched cladding with a high Q-factor (>750,000). Optics Express. 20. 15503 - 15515.
  • Gai, X*. , Choi, D. , Madden, S. & Luther-Davies, B. (2012). Polarization-independent chalcogenide glass nanowires with anomalous dispersion for all-optical processing. Optics Express. 20. 13513 - 13521.
  • Gai, X*. , Choi, D. , Madden, S. , Yang, Z. , Wang, R. & Luther-Davies, B. (2012). Supercontinuum generation in the mid-infrared from a dispersion-engineered As2S3 glass rib waveguide. Optics Letters. 37. 3870 - 3872.
  • Gai, X*. , Choi, D. , Madden, S. & Luther-Davies, B. (2011). Interplay between Raman scattering and four-wave mixing in As2S3 chalcogenide glass waveguides. Journal of the Optical Society of America B. 28. 2777 - 2784.
  • Gai, X*. , Madden, S. , Choi, D. , Bulla, D. & Luther-Davies, B. (2010). Dispersion engineered Ge11.5As24Se64.5 nanowires with a nonlinear parameter of 136W-1m-1 at 1550nm. Optics Express. 18. 18866 - 18874.
  • Gai, X. , Han, T. , Prasad, A. , Madden, S. , Choi, D. , Wang, R. , Bulla, D. & Luther-Davies, B. (2010). Progress in optical waveguides fabricated from chalcogenide glasses. Optics Express. 18. 26635 .
  • Lee, M. , Grillet, C. , Monat, C. , Magi, E. , Tomljenovic-Hanic, S. , Gai, X. , Madden, S. , Choi, D. , Bulla, D. & Luther-Davies, B. (2009). Photosensitive and thermal nonlinear effects in chalcogenide photonic crystal cavities. Optics Express. 18. 26695 .
  • Lee, M. , Grillet, C. , Tomljenovic-Hanic, S. , Magi, E. , Moss, D. , Eggleton, B. , Gai, X. , Madden, S. , Choi, D. , Bulla, D. & Luther-Davies, B. (2009). Photowritten high-Q cavities in two-dimensional chalcogenide glass photonic crystals. Optics Letters. 34. 3671 - 3673.
  • Lamont, M. , Luther-Davies, B. , Choi, D. , Madden, S. , Gai, X. & Eggleton, B. (2008). Net-gain from a parametric amplifier on a chalcogenide optical chip. Optics Express. 16. 20374 .
  • Sun, X. , Shen, W. , Gai, X. , Gu, P. , Liu, X. & Zhang, Y. (2008). Optical thin-film reflection filters based on the theory of photonic crystals. Applied Optics. 47.

Book Chapter

  • Gai, X. , Choi, D. , Madden, S. & Luther-Davies, B. (2015). Materials and structures for waveguide nonlinear photonics. All-optical signal processing: data communication and storage applications. Springer. ISBN 978-3-319-14991-2.


External Services


Professional Activity

  • 2017 - Now, Grant Assessor of Australian Research Council .
  • 2009 - Now, Reviewer of Advanced Materials, Scientific Report, Journal of Selected Topics in Quantum Electronics, Optics Letters, Optics Express, Optical Material Express, Optics Communication, etc..

Consultancy Service

  • 2016 - Now, Technical advisor, SOPtech.Australia.
  • 2014 - 2015, Technical advisor, Hewlett Packard Labs.USA.


Service in CityU


Research / Thesis Supervision

  • 2016 - 2017, Supervisor, Haijie Zuo, Exchange PhD (ANU), Project “Amorphous silicon photonics”.
  • 2015 - 2016, Supervisor, Jiajie Pei, Exchange PhD (ANU), Project “Advanced O2 plasma etching for phosphorene”.
  • 2013 - 2016, Supervisor, Ting Wang, PhD (ANU), Thesis “Investigation on microstructure and properties of Ge-As-Se chalcogenide glasses”.
  • 2013 - 2016, Supervisor, Yi Yu, PhD (ANU), Thesis “Mid-infrared supercontinuum generation in chaclogenides”.


Last update date : 12 Jul 2018