Dr Kishan Menghrajani

Postdoctoral Research Fellow

K.S.Menghrajani@exeter.ac.uk

Overview

Kishan Menghrajani did his Ph.D. under Professor Bill Barnes and professor Geoff Nash in the Centre for Doctoral Training(CDT) in Metamaterials at University of Exeter, and his PhD project was entitled 'Strong Coupling of Molecular Vibrational Resonances’.

He is currently working as Postdoctrol Research Fellow under Professor Bill Barnes on a collaborative project with the Chemistry Department at Sheffield University, to explore the use of strong coupling of pigment molecules. This post-doc project is sponsored by The Leverhulme Trust.

He is an active member of Physics inclusivity working group.

Personal Website: kishanmenghrajani.info

Postdoctoral Research Fellow 2019- date

P.I. Professor Bill Barnes, University of Exeter

Professor Graham Leggett, University of Sheffield

Ph.D. (Physics) 2015-2019

Physics (Metamaterials), University of Exeter

P.I. Professor Bill Barnes

Professor Geoff Nash

Project Associate 2013-2015

Computational Photonics, Indian Institute of Science

P.I. Associate Professor Murugesan Venkatapathi

Honours & Awards

International Exchange grant, PI, 2022-2023, Royal Society

International Ph.D. EPSRC studentship, 2015-2019, CDT Metamaterials, University of Exeter

Organizing committee member, IONS Conference, July 9-12, 2019, University of Exeter

Physics inclusively working group, Dec 2020- till date, University of Exeter

SPIE Exeter chapter Advisor 2021- till date

Merit scholarship in Masters, 2012-2013

Department of Science and Technology (DST) scholarship in Master, 2011-2013

Publications

No publications found

Further information

PhD Project

Excitonics: an organic route to Metamaterials

Supervisors: Prof. Bill Barnes and Prof. Geoff Nash

Many electromagnetic metamaterials are based on metallic elements (meta-atoms) – they make use of the plasmonic modes these elements support. Metals are well suited to this purpose owing to the negative permittivity they possess. The plasmon modes associated with this negative permittivity have the important property that their associated electromagnetic fields are confined to volumes much smaller than the resonant (plasmon) wavelength; one can thus pack many plasmonic elements into a sub-wavelength volume, thereby enabling metamaterials to be made. Other materials may also exhibit negative permittivity – an interesting and little explored class of such materials are excitonic materials such as some dye-doped polymers. Here we will explore the use of such materials as a means to make metamaterials. We have already shown that nanostructures of dye-doped polymers may support localised (excitonic) electromagnetic modes (Nano Lett., 14, 2339 (2014)), enabling optical fields to be confined and enhanced in just the same way that metals afford through the (plasmonic) electromagnetic modes they support. This is a very new area – largely unexplored. We will investigate: how to nanostructure excitonic materials, look at the localised modes supported by these nanostructures, and then explore how these individual structures may be assembled so as to build metamaterials. The properties of these metamaterials will then be investigated, including multilayer structures and arrays of excitonic meta-atoms. In the latter stages of the project we may explore the possibility of assembling them from sustainable materials such as cellulose doped with naturally occurring dyes.