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16 papers
When Plasmonic Colloids Meet Optical Vortices -- A Brief Review
G. V. Pavan Kumar
Structured light has emerged as an important tool to interrogate and manipulate matter at micron and sub-micron scale. One form of structured light is an optical vortex beam. The h…
Modulation of trion and exciton formation in monolayer WS2 by dielectric and substrate engineering
Tamaghna Chowdhury, Diptabrata Paul, Divya Nechiyil +5
Photoluminescence (PL) of transition metal dichalcogenide (TMD) monolayers is strongly influenced by the dielectric environment. The defect states present in the substrate induces…
Simultaneous detection of spin and orbital angular momentum of light through scattering from a single silver nanowire
Diptabrata Paul, Deepak K Sharma, G V Pavan Kumar
In recent times the spin angular momentum (SAM) and orbital angular momentum (OAM) of light have gained prominence because of their significance in optical communication systems, m…
Single Molecule SERS in a Single Gold Nanoparticle-driven Thermoplasmonic Tweezer
Sunny Tiwari, Utkarsh Khandelwal, Vandana Sharma +1
Surface enhanced Raman scattering (SERS) is optically sensitive and chemically specific to detect single molecule spectroscopic signatures. Facilitating this capability in opticall…
Beaming Elastic and SERS Emission from Bent-Plasmonic Nanowire on a Mirror Cavity
Sunny Tiwari, Adarsh B. Vasista, Diptabrata Paul +2
We report on the experimental observation of beaming elastic and surface enhanced Raman scattering (SERS) emission from a bent-nanowire on a mirror (B-NWoM) cavity. The system was…
Sub-Wavelength Plasmon Polaritons Channeling of Whispering Gallery Modes of Fluorescent Silica Microresonator
Sunny Tiwari, Chetna Taneja, G. V. Pavan Kumar
Herein, we report sub-wavelength propagation and directional out-coupling of whispering gallery modes (WGMs) of a fluorescent silica microsphere resonator mediated via plasmon pola…
Experimental observation of transverse spin of plasmon polaritons in a single-crystalline silver nanowire
Chetna Taneja, Diptabrata Paul, G V Pavan Kumar
We report the experimental observation of the transverse spin and associated spin-momentum locking of surface plasmon polaritons (SPPs) excited in a plasmonic single crystalline si…
Momentum-resolved surface enhanced Raman scattering from a nanowire-nanoparticle junction cavity
Adarsh B. Vasista, Shailendra K. Chaubey, David J. Gosztola +3
Herein we report experimental evidence of directional SERS from molecules situated inside a single nanowire-nanoparticle junction cavity. The emission was confined to a narrow rang…
Plasmonic nanowire coupled to zero-dimensional nanostructures: A brief review
Sunny Tiwari, Chetna Taneja, G V Pavan Kumar
Metal nanowires and nanoparticles that facilitate surface plasmons are of contemporary interest in nanophotonics, thermoplasmonics and optoelectronics. They facilitate not only sub…
Broad Band Single Germanium Nanowire Photodetectors with Surface Oxide Controlled High Optical Gain
Shaili Sett, Ankita Ghatak, Deepak Sharma +2
We have investigated photoconductive properties of single Germanium Nanowires(NWs)of diameter less than 100 nm in the spectral range of 300 to 1100 nm showing ultra large peak Resp…
Observation of photonic spin-momentum locking due to coupling of achiral metamaterials and quantum dots
Ravindra Kumar Yadav, Wenxiao Liu, SRK Chaitanya Indukuri +4
Here, we report observations of photonic spin-momentum locking in the form of directional and chiral emission from achiral quantum dots (QDs) evanescently coupled to achiral hyperb…
Large-scale optothermal assembly of colloids mediated by a gold microplate
Vandana Sharma, Diptabrata Paul, Shailendra K Chaubey +2
Light-activated colloidal assembly and swarming can act as model systems to explore non-equilibrium state of matter. In this context, creating new experimental platforms to facilit…
Quantum emitter coupled to plasmonic nanotriangle: Spatially dependent emission and thermal mapping
Adarsh B. Vasista, G. V. Pavan Kumar
Herein we report on our studies of radiative and non-radiative interaction between an individual quantum emitter and an anisotropic plasmonic nanostructure: a gold nanotriangle. Ou…
Fourier plane optical microscopy and spectroscopy
Adarsh B. Vasista, Deepak K. Sharma, G V Pavan Kumar
Intensity, wavevector, phase, and polarization are the most important parameters of any light beam. Understanding the wavevector distribution has emerged as a very important proble…
Plasmofluidic Single-Molecule Surface Enhanced Raman Scattering from Dynamic Assembly of Plasmonic Nanoparticles
Partha Pratim Patra, Rohit Chikkaraddy, Ravi P. N. Tripathi +2
Single-molecule surface enhanced Raman scattering (SM-SERS) is one of the vital applications of plasmonic nanoparticles. The SM-SERS sensitivity critically depends on plasmonic hot…
Directional out-coupling of light from a plasmonic nanowire-nanoparticle junction
Danveer Singh, Arindam Dasgupta, Aswathy V. G. +2
We experimentally show how a single Ag nanoparticle (NP) coupled to an Ag nanowire (NW) can convert propagating surface plasmon polaritons to directional photons. By employing dual…