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RISS 인기검색어
- 검색키워드
- 저자 : Ritesh Agarwal (검색결과 7 건)
- 무료
- 기관 내 무료
- 유료
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Aspetti, Carlos O.,Cho, Chang-Hee,Agarwal, Rahul,Agarwal, Ritesh American Chemical Society 2014 NANO LETTERS Vol.14 No.9
<P/><P>By integrating silicon nanowires (∼150 nm diameter, 20 μm length) with an Ω-shaped plasmonic nanocavity, we are able to generate broadband visible luminescence, which is induced by high order hybrid nanocavity-surface plasmon modes. The nature of this super bandgap emission is explored via photoluminescence spectroscopy studies performed with variable laser excitation energies (1.959 to 2.708 eV) and finite difference time domain simulations. Furthermore, temperature-dependent photoluminescence spectroscopy shows that the observed emission corresponds to radiative recombination of unthermalized (hot) carriers as opposed to a resonant Raman process.</P>
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Two Dimensional Electronic Spectroscopy
Fleming, Graham R.,Yang, Min-O,Agarwal, Ritesh,Prall, Bradley S.,Kaufman, Laura J.,Neuwahl, Fred Korean Chemical Society 2003 Bulletin of the Korean Chemical Society Vol.24 No.8
Two different electronically resonant two-dimensional spectroscopies are described. The first, two-color photon echo peak shift spectroscopy, is sensitive to correlations in transition frequency between the initial and probed (final) states. It provides new insight into the mechanism of ultrafast solvation and should prove useful for characterizing dynamics in inhomogeneous systems in general. The second technique, fifth order threepulse scattering, contains two coherence periods whose durations are controlled. The entire two-dimensional surface was recorded for a dye molecule in dilute solution and a photosynthetic light-harvesting complex. The data provide insight into the short-time dynamics of solvation and exciton relaxation, respectively.
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Two-color Transient Grating Spectroscopy of a Two-level System
Kwak, Kyoung-Won,Cho, Min-Haeng,Fleming, Graham R.,Agarwal, Ritesh,Prall, Bradley S. Korean Chemical Society 2003 Bulletin of the Korean Chemical Society Vol.24 No.8
A theoretical description and experimental demonstration of homodyne-detected two-color transient grating (2-C TG) signal are presented. By treating the coupled bath degrees of freedom as a collection of harmonic oscillators and using a short-time expansion method, approximated nonlinear response functions were obtained. An analytic expression for the two-color transient grating signal was obtained by carrying out relevant Gaussian integrals. The initial rising and decaying parts of the 2-C TG signal is shown to be critically dependent on the ultrafast inertial component of the solvation correlation function. The experimental results confirm the predictions of the theoretical model.
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Chung, Hee-Suk,Jung, Yeonwoong,Kim, Seul Cham,Kim, Do Hyun,Oh, Kyu Hwan,Agarwal, Ritesh American Chemical Society 2009 NANO LETTERS Vol.9 No.6
<P>We report self-assembly of highly aligned GeTe nanowires epitaxially grown on octahedral GeTe microcrystals in two well-defined directions by using one-step vapor transport process. The epitaxial relationship of nanowires with underlying microcrystals along with the growth orientations of nanowires were investigated in detail by electron microscopy combined with atomic unit cell models. We demonstrate that maximizing atomic planar density to minimize energy of the exposed surfaces is the determining factor that governs the unique growth characteristics of micro/nanostructures that evolve from three-dimensional octahedral microcrystals to tetrahedral bases to finally one-dimensional nanowires. The crystallographic understanding of structuring of crystalline nanomaterials obtained from this study will be critical to understand, predict, and control the growth orientation of nanostructures in three-dimensions.</P>
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