Publications de Debdatta Ray | EPFL Graph Search

A Low-Temperature Annealing Method for Alloy Nanostructures and Metasurfaces: Unlocking a Novel Degree of Freedom

Christian Santschi, Olivier Martin, Debdatta Ray, Jeonghyeon Kim, Hsiang-Chu Wang

The material and exact shape of a nanostructure determine its optical response, which is especially strong for plasmonic metals. Unfortunately, only a few plasmonic metals are available, which limits the spectral range where these strong optical effects ca ...

Wiley-V C H Verlag Gmbh2022

Multipolar scattering analysis of hybrid metal-dielectric nanostructures

Olivier Martin, Debdatta Ray, Andrei Kiselev

We perform a systematic study showing the evolution of the multipoles along with the spectra for a hybrid metal-dielectric nanoantenna, a Si cylinder and an Ag disk stacked one on top of another, as its dimensions are varied one by one. We broaden our anal ...

2021

Fabrication and applications of AuAg alloy metasurfaces and hybrid metal dielectric nanoantennas

Debdatta Ray

The most prevalent materials used in the field of plasmonics are Au and Ag. However, for the past few years, the plasmonic community has also been looking for alternative materials that have lower losses than Au and higher stability than Ag. This thesis is ...

EPFL2021

Hologram generated by alloy metasurfaces

Olivier Martin, Debdatta Ray, Hsiang-Chu Wang

2020

Hybrid Metal-Dielectric Metasurfaces for Refractive Index Sensing

Christian Santschi, Olivier Martin, Raziman Thottungal Valapu, Hatice Altug, Dordaneh Etezadi, Debdatta Ray

Hybrid metal-dielectric nanostructures have recently gained prominence because they combine strong field enhancement of plasmonic metals and the several low-loss radiation channels of dielectric resonators, which are qualities pertaining to the best of bot ...

AMER CHEMICAL SOC2020

Extending limits of plasmonics with unconventional metasurfaces

Olivier Martin, Raziman Thottungal Valapu, Madasamy Thangamuthu, Debdatta Ray, Jeonghyeon Kim, Hsiang-Chu Wang

2020

Extending the limits of conventional plasmonics with low temperature alloying of noble metals

Christian Santschi, Olivier Martin, Debdatta Ray, Jeonghyeon Kim, Hsiang-Chu Wang

2020

Plasmonic nanostructures made of Au/Ag alloyed at low temperature: Unlocking an additional degree of freedom

Olivier Martin, Debdatta Ray, Jeonghyeon Kim

2019

Expanding the realms of plasmonics with Au/Ag alloy nanostructures and metasurfaces

Olivier Martin, Debdatta Ray

2019

Fabrication of alloyed plasmonic nanostructures

Olivier Martin, Debdatta Ray, Haohua Li, Ji Zhou

We have fabricated homogeneous thin films of an alloy of Au and Ag, by annealing two consecutive deposited layers of Au and Ag. We have also successfully fabricated nanodisks and nanorods made of AuAg alloys by annealing the nanostructures at 300 degrees C ...

IEEE2018

Hybrid Metallodielectric Metasurfaces for Sensing

Christian Santschi, Olivier Martin, Debdatta Ray

We have fabricated metasurfaces that combine silicon resonators with aluminium disks. While the latter produce strong near-field enhancement, the former support optical resonances that can be used to obtain well-controlled far-field signatures. ...

IEEE2018