230 citations · 928 across the 29 of their papers we have counts for
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Spectrally tunable, large Raman enhancement from nonradiative energy transfer in van der Waals heterostructure
Medha Dandu, Kenji Watanabe, Takashi Taniguchi +2
Raman enhancement techniques are essential for fundamental studies in light-matter interactions and find widespread application in microelectronics, bio-chemical sensing, and clini…
Ultrafast Response of Plasmonic Nanostructures
Sunil Kumar, A. K. Sood
Plasmonic metal nanostructures are an integral part of nanophotonic device applications owing to their ability to generate strong localized electromagnetic fields when illuminated…
Probing ultrafast carrier dynamics and nonlinear absorption and refraction in core-shell silicon nanowires
Sunil Kumar, M. Khorasaninejad, M. M. Adachi +3
We investigate the relaxation dynamics of photogenerated carriers in silicon nanowires consisting of a crystalline core and a surrounding amorphous shell, using femtosecond time-re…
Ultrafast Dynamics of Gold Nanorods: Tuning between Photo-Bleaching and Photo-Induced Absorption
M. Anija, Sunil Kumar, N. Kamaraju +3
We report ultrafast electron dynamics in gold nanorods investigated using 80 fs laser pulses centered at 1.57 eV. Five types of nanorod colloidal suspensions in water having their…
Direct observation of low frequency confined acoustic phonons in silver nanoparticles: Terahertz time domain spectroscopy
Sunil Kumar, N. Kamaraju, B. Karthikeyan +3
Terahertz time domain spectroscopy has been used to study low frequency confined acoustic phonons of silver nanoparticles embedded in poly(vinyl alcohol) matrix in the spectral ran…