Electronics and communication industries are based on two fundamental elementary particles?electrons and photons. While electrons are used for information processing and storage in CMOS transistors, photons are used to transmit the processed information via fibre optic networks. ?Over the last four decades ultra-fast fiber optic networks have dominated long distance communication systems (e.g. long haul fiber optic telecom networks) and even most of the data communication networks (e.g. using active optical cables). However, for short reach communications (<1m), e.g. rack-to-rack communication or inter- and intra-chip communications, metal interconnects are still predominantly used. As the demand for higher bandwidth at lower energy consumption is increasing, optical interconnection for inter-chip or even chip scale communication is soon becoming a necessity. This is because metal based interconnects are reaching their physical limits due to their prohibitively high energy consumption at higher data rates.
However, due to the material incompatibility between the two technologies, i.e. silicon for electronics and conventionally III-V and electro-optic materials (e.g. LiNbO3) for photonics, bring optical communication closer to the transistors has not yet been possible. The primary goal of my research activity is to bridge these two domains using Silicon Photonic Technology. For further details on current research topics and open positions please visit my website.
Cascaded modulator architecture for WDM applications by Debnath K., Ofaolain L. , Gardes F. Y., Steffan A. G., Reed G. T., Krauss T. F. Optics Express 20 27420-27428 (2012)
All-silicon carrier accumulation modulator based on a lateral MOS-capacitor by Debnath K., Thomson D. , Zhang W. , Khokhar A. Z., Littlejohns C. , Byers J. , Mastronardi L. , Husain M. K., Ibukuro K. , Gardes F. Y., Reed G. T., Saito S. Photonics Research 6 373-379 (2018)
Highly efficient optical filter based on vertically coupled photonic crystal cavity and bus waveguide by Debnath K., Welna K. , Ferrera M. , Deasy K. , Lidzey D. G., O L. Optics Letters 38 154-156 (2013)
Dielectric waveguide vertically coupled to all-silicon photodiodes operating at telecommunication wavelengths by Debnath K., Gardes F. Y., Knights A. P., Reed G. T., Krauss T. F., O'faolain L. Applied Physics Letters 102 171106- (2013)
Lithographic wavelength control of an external cavity laser with a silicon photonic crystal cavity-based resonant reflector by Liles A., Debnath K. , O'faolain L. Optics Letters 41 894-897 (2016)
Ultrahigh-Q photonic crystal cavities in silicon rich nitride by Debnath K., Clementi M. , Bucio T. D., Khokhar A. Z., Sotto M. , Grabska K. M., Bajoni D. , Galli M. , Saito S. , Gardes F. Y. Optics express 25 27334-27340 (2017)
Photonic crystal waveguides on silicon rich nitride platform by Debnath K., Bucio T. D., Al-attili A. A., Khokhar A. Z., Saito S. , Gardes F. Y. Optics Express 25 3214-3221 (2017)
Fabrication of Arbitrarily Narrow Vertical Dielectric Slots in Silicon Waveguides by Debnath K., Khokhar A. Z., Reed G. T., Saito S. Photonics Technology Letters 29 1269-1272 (2017)
Low-loss silicon waveguides and grating couplers fabricated using anisotropic wet etching technique by Debnath K., Arimoto H. , Husain M. K., Prasmusinto A. , Al-attili A. , Petra R. , Chong H. M., Reed G. , Saito S. Frontiers in Materials 3 10- (2016)
Electro-optic modulation in bulk silicon using surface plasmon resonance by Debnath K., Damas P. , O'faolain L. Photonics and Nanostructures-Fundamentals and Applications 18 31-35 (2016)