Rohit P. Prasankumar

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We demonstrate a nanoscale, subpicosecond (ps) metamaterial device capable of terabit/second all-optical communication in the near-IR. The 600 fs response, 2 orders of magnitude faster than previously reported, is achieved by accessing a previously unused regime of high-injection level, subpicosecond carrier dynamics in the alpha-Si dielectric layer of the(More)
This bibliography lists publications and papers and talks presented or published by RLE faculty, staff, and students during 1998, and each section is in alphabetical order by author's name. Section 1 is a list of papers and talks; copies of these papers may be obtained by contacting the authors directly. Section 2 lists journal articles that were published(More)
We use ultrafast optical microscopy to investigate carrier dynamics in single flakes of atomically thin molybdenum disulfide. By tuning the probe wavelength through the bandgap, we reveal the influence of layer thickness on carrier dynamics.
We demonstrate a new paradigm for all-optical detection and control of interfacial magnetoelectric coupling on ultrafast timescales, achieved by using time-resolved second harmonic generation (SHG) in a ferroelectric/ferromagnet oxide heterostructure.
The mechanisms producing strong coupling between electric and magnetic order in multiferroics are not always well understood, since their microscopic origins can be quite different. Hence, gaining a deeper understanding of magnetoelectric coupling in these materials is the key to their rational design. Here, we use ultrafast optical spectroscopy to show(More)
We present the first ultrafast time-resolved, polarization-dependent experiments on both single- and ensemble-silicon nanowires using non-degenerate spectroscopy. Anisotropy was observed for polarizations perpendicular and parallel to the nanowire.
Visible pump-probe spectroscopy isolates the femtosecond Drude response of a photo generated electron-hole plasma in monolayer graphene. The observed VN scaling versus carrier density reveals the relativistic nature of the electron-hole plasma.
Temperature-dependent femtosecond optical spectroscopy is used to track polaron dynamics in the spin and charge frustrated system LuFe<inf>2</inf>O<inf>4</inf>, revealing the influence of charge and spin ordering on polaron excitation, redressing, and coupling to on-site excitations.