Gour Mohan Das

Gour Mohan Das
Italian National Research Council | CNR · Institute Experimental Endocrinology and Oncology "Gaetano Salvatore" IEOS

PhD

About

16
Publications
1,836
Reads
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171
Citations
Citations since 2016
16 Research Items
169 Citations
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050
Additional affiliations
January 2021 - present
Istituto per l'endocrinologia e l'oncologia "Gaetano Salvatore" (IEOS) Italian National Research Council
Position
  • PostDoc Position
Education
July 2015 - December 2020
Indian Institute of Technology Patna
Field of study
  • Nanophotonics

Publications

Publications (16)
Article
Recently, the surface enhanced fluorescence technique has been helpful for several biological applications. Some researchers have reported the SEF of fluorophores such as dye molecules and QDs using dielectric spacers formed by several approaches. Herein, for the first time, we report the SEF spectra of CdSeS/ZnS alloyed quantum dots (QDs) that hav...
Article
Full-text available
Surface-enhanced Raman spectroscopy (SERS) has become a powerful tool for biosensing applications owing to its fingerprint recognition, high sensitivity, multiplex detection, and biocompatibility. This review provides an overview of the most significant aspects of SERS for biomedical and biosensing applications. We first introduced the mechanisms a...
Article
The Au-Ag bimetallic nanostructures were synthesized independently using three different reducing agents [ascorbic acid (C6H8O6), sodium borohydride (NaBH4) and tri-sodium citrate dihydrate (C6H9Na3O9)] to understand their effect on the morphology of the nanostructures. The nanostructures obtained using the reducing agents mentioned in above order,...
Article
Au-Ag bimetallic nanostructures with blunt and sharp sprouts are synthesized using a high yield one-step synthesis process. For the first time, these nanostructures are obtained at different growth times in the same synthesis process. The synthesized nanostructures are characterized using a field emission-scanning electron microscope, transmission...
Article
Full-text available
For the first time, we propose a bimetallic-photonic whispering gallery mode (WGM) hybrid microresonator for the detection and sizing of single protein molecules in real time. To optimize the sensitivity of hybrid microresonators, theoretical simulations have been carried out to understand the optical properties of different types of Au-Ag bimetall...
Article
Full-text available
Finite element method (FEM) simulations have been carried out on free-standing and finite dielectric substrate-supported eccentric (i) silica core-gold nanoshell dimers and (ii) gold core-silica nanoshell dimers for understanding their near- and far-field plasmonic properties. In the case of eccentric silica core-gold nanoshell dimers, multiple pea...
Article
Full-text available
Herein, for the first time, we report the single molecule surface enhanced resonance Raman scattering (SERRS) and surface enhanced Raman scattering (SERS) spectra with high signal to noise ratio (S/N) using plasmon-active substrates fabricated by sprouted potato shaped Au-Ag bimetallic nanoparticles, prepared using a new one-step synthesis method....
Article
Full-text available
Herein, we report finite element method simulated near-field spectra of single nanoshell dimers placed over nano- and micro-scale dielectric substrates. The simulations have been carried out on an individual basis for the top and bottom illuminated nanodimers with plane wave (PW) and focused Gaussian beam (FGB). Only one peak has been observed in t...
Article
Full-text available
We propose a high-quality-factor nanoplasmonic–whispering-gallery-mode (WGM) hybrid microresonator (HMR) for the enhancement of a single-molecule Raman scattering signal. Using the reactive sensing principle, we have analytically developed a working formula for estimating the enhancement factor (η) that depends on the quality factor of the WGM as w...
Conference Paper
The well known surface enhanced Raman scattering (SERS) needs a lot of experimental optimization for its proper implementation. In this report, we demonstrate the efficient SERS using gold nanoparticles (AuNPs) on quartz plate. The AuNPs were prepared by depositing direct current sputtered Au thin film followed by suitable annealing. The parameters...
Conference Paper
Study of single/few molecule Raman scattering is one of the paramount interests for physicists and biologists. So far, only a few researchers have been succeeded in obtaining single molecule Raman spectra using the conventional surface enhanced Raman scattering (SERS) technique. However, the S/N ratio of the vibrational modes are found to be visibl...
Article
We report the enhancement of Raman scattering signal for the first time using photonic nanojet of a lollipop-shaped microstructure (LMS) fabricated with the help of a nanosecond CO2 laser. The LMS consists of a dielectric microsphere attached to a long stem/tapered fiber. The enhancement was achieved by focusing the incident laser light on sample s...
Article
Finite element method simulations have been carried out on the photonic nanojet (PNJ) mediated surface enhanced Raman scattering (SERS) technique for the first time, and this technique has been found to provide (i) better Raman scattering enhancement of single molecules and (ii) a long working distance between the microscopic objective lens and sam...
Article
Full-text available
We report a high-yield synthesis of star-shaped gold nanostructures in one step, using a new surfactant-free wet chemistry method. Compared to the existing reports, these nanostars were found to have longer and sharper spikes anchored uniformly on the surface of the spherical core, allowing at least a few hot spots irrespective of the incident ligh...
Article
We report a two-step enhancement of Raman scattering signal (η) of a few dye molecules. In the first step, high-quality surface-enhanced Raman scattering (SERS) substrates have been used. The SERS substrates were fabricated by direct current sputtering of Au followed by thermal annealing. The role of thermal annealing of the SERS substrates and num...
Conference Paper
Full-text available
Now a days, single molecule surface enhanced Raman spectroscopy (SMSERS) has become a fascinating tool for studying the structural properties, static and dynamic events of single molecules (instead of ensemble average), with the help of efficient plasmonic nanostructures. This is extremely useful in the field of proteomics because the structural pr...

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