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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…