Subhasish Chakraborty

Subhasish Chakraborty


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Dr. Subhasish Chakraborty is a Senior Lecturer (Associate Professor) in the Materials, Devices and Systems (MDS) Research Division (Electrical and Electronic Engineering) and a member of the Photon Science Institute. Dr. Chakraborty’s research programme encompasses theory, simulation, nanofabrication and measurement of aperiodic lattices as applied to silicon nanophotonics, THz quantum cascade lasers (QCLs) and graphene, which is directly aligned with the 'Atoms to Devices' strand of the Henry Royce Institute (HRI). As sole-PI, he previously led the EPSRC grant “Aperiodic Lattices for Photonic Engineering of THz QCLs” (EP/G064504/1), a follow-on EPSRC grant, and an international researcher grant from HMGCC. His research led to several “World First” results: the first integrated tunable graphene laser (Science, 2016); the first electronically tunable THz-over-Fibre (ToF) system (THz mixer and optical fiber coupled THz mixer, US Patent Application 0248047, 2015; Opt. Exp., 2017; Appl. Phys. Lett. 2017 (published as Editor’s pick); first electronically tunable THz QCL PICs (Optics Letters, 2021; Optics Express, 2016; IEEE Phot. Tech. Lett. 2016; Appl. Phys. Lett. 2013(i); J. Appl. Phys. 2013; Appl. Phys. Lett. 2013(ii); Opt. Exp., 2012; Appl. Phys. Lett. 2012).


Dr. Chakraborty’s lab has state-of-the-art capabilities for testing high-precision spectra for quantum nanodevices with cryogenic capability. He envisages to integrate terahertz opto-plasmonic graphene chips with QCLs alongside active and passive photonic crystal optical elements, to provide high-complexity and important on-chip photonic networking and information processing functionalities, thereby creating a flexible and powerful terahertz-frequency quantum technology platform, to enable high-density scaling of opto-plasmonic integrated circuits and quantum networks.


Dr. Subhasish Chakraborty obtained his first class Bachelor of Science degree in Physics and subsequent Bachelor of Technology degree in Radio-Physics and Electronics from the University of Calcutta, India (1991-1997). His research career began as a Research Engineer with Philips Telecommunications. At Philips (1997-1998) he developed high-frequency electronic circuits and phase-lock-loop synthesizers for application in private mobile radios, base stations and systems. In 1998 he went to the University of Cambridge as a Cambridge Commonwealth Trust Scholar, where he obtained his post-graduate degree in Microelectronic Engineering and Nanophotonics jointly with the Cavendish Laboratory (Department of Physics) and the Department of Engineering.  Following doctoral (1999-2003) and post-doctoral research at the University of Cambridge (2003-2005) and at the University of Leeds (2005-2007), he then moved to the University of Manchester as a Lecturer to develop THz QCLs and associated nanophotonics and plasmonics technologies (2007).


Dr. Chakraborty has served as a referee for the UK and European Research Councils and as an external PhD examiner for the Universities of Cambridge, Essex and Kent. He is a life-member of the Optical Society of America (OSA).

Research interests

Electronically Tunable Terahertz over Fibre

Terahertz semiconductor laser sources have been an active area of research at a handful of leading institutions around the globe over the last decade, including the Universities of Cambridge and Leeds in the UK, and MIT and Harvard in the USA. By developing new laboratory facilities here, as the results to date show, the University of Manchester is the latest addition to this group. This facility enabled him to carry out work aimed at developing, for the first time, photonically mediated wavelength tuning of terahertz quantum cascade lasers grown by his collaborators in the University of Cambridge. This facility is world leading, providing a micro-manipulated cryogenic probe system, which allows one to couple in both microwave and telecom signal into an electronically tunable terahertz quantum cascade laser through waveguides and optical fibres, respectively.  This is an extremely flexible system, which will open up a broad range of opportunities for developing terahertz system concepts.

Terahertz photonic devices remain a strong sector worldwide and the field is now moving into applications areas in medicine, security and terabit/sec data communication and the research work from Dr Chakraborty’s group is ideally placed to take advantage of this trend. In particular, the new Terahertz-over-Fibre initiative, a doctoral thesis on which has recently been awarded to one of his PhD students (Md. Khairuzzaman), is adding a new and major strength to the UK effort. For example, this approach complements extremely well plans on UCL’s £6.5M EPSRC joint programme grant with Cambridge and Leeds, where they hope to develop systems for use in fundamental science (e.g. the study of nanostructured and mesoscopic electron systems) and for applications including short-range high-data-rate wireless communications, information processing, materials detection and high resolution imaging in three dimensions.

Graphene controlled QCL

There is a new dimension to Dr Chakraborty’s work which needs to be emphasised here.  It has emerged in the past few years that Graphene is a near perfect material for aperiodic grating fabrication on these THz lasing devices. Graphene is highly conducting, virtually transparent and offers highly efficient evanescent coupling: it possesses all of the materials properties required for the plasmonic interactions which feed the wavelength tuning discovered and theoretically modelled by Dr Chakraborty.  Engineering applications of Graphene are at the core of the mission statement for the National Graphene Institute and that Institute is urgently seek in engineering input from the relevant Schools within the University of Manchester. Dr Chakraborty has developed a strong collaborative link with Prof Kostya Novoselov in the School of Physics and Astronomy. They have been working on a Graphene-THz project now growing within the group, and he is currently supervising a PDRA and two PhD students within that project. The research outcomes from Dr Chakraborty’s recent work on Graphene have several key applications. This work was reported in the postdeadline session (Paper CTh5c) in CLEO-2013 and UMIP are now actively pursuing the development two worldwide patent applications.

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Research Beacons, Institutes and Platforms

  • Photon Science Institute


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