S
Sivarama Krishnan
Researcher at Indian Institute of Technology Madras
Publications - 72
Citations - 858
Sivarama Krishnan is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Ionization & Laser. The author has an hindex of 15, co-authored 60 publications receiving 687 citations. Previous affiliations of Sivarama Krishnan include Max Planck Society & Tata Institute of Fundamental Research.
Papers
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Optical diode action from axially asymmetric nonlinearity in an all-carbon solid-state device.
Benoy Anand,Ramakrishna Podila,Kiran Lingam,Sivarama Krishnan,S. Siva Sankara Sai,Reji Philip,Apparao M. Rao +6 more
TL;DR: This experimental realization of the first all-carbon solid-state optical diode that is based on axially asymmetric nonlinear absorption in a thin saturable absorber (graphene) and a thin reverse saturable absorption (C60) arranged in tandem is reported.
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Focal dynamics of multiple filaments: Microscopic imaging and reconstruction
P. Prem Kiran,P. Prem Kiran,Suman Bagchi,Sivarama Krishnan,Cord L. Arnold,G. Ravindra Kumar,Arnaud Couairon +6 more
TL;DR: In this paper, the complete dynamics of the propagation of very intense femtosecond laser pulses in air under tight focusing conditions via direct imaging of the entire interaction zone was observed by means of numerical simulations.
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Filamentation without intensity clamping.
P. Prem Kiran,Suman Bagchi,Cord L. Arnold,Sivarama Krishnan,G. Ravindra Kumar,Arnaud Couairon +5 more
TL;DR: Measurements of the supercontinuum emission from ultrashort Ti:Saph laser pulse filamentation in air in a tightly focused geometry indicate that peak intensities exceed the clamping value of a few 10(13) W/cm(2) obtained for filamentations in a loose focusing geometry by at least one order of magnitude.
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The role of defects in the nonlinear optical absorption behavior of carbon and ZnO nanostructures
Benoy Anand,Sivarama Krishnan,Ramakrishna Podila,S. Siva Sankara Sai,Apparao M. Rao,Reji Philip +5 more
TL;DR: It is shown that defect engineering is an effective strategy for tailoring the nonlinear optical properties of carbon and ZnO nanostructures in device applications such as optical limiting, optical switching, pulse shaping, pulse compression and optical diode action.
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Charge Transfer and Penning Ionization of Dopants in or on Helium Nanodroplets Exposed to EUV Radiation
Dominic Buchta,Sivarama Krishnan,Nils Benedict Brauer,Marcel Drabbels,Patrick O'Keeffe,Michele Devetta,Michele Di Fraia,Carlo Callegari,Robert Richter,Marcello Coreno,Kevin C. Prince,Frank Stienkemeier,Robert Moshammer,Marcel Mudrich +13 more
TL;DR: The surprising finding is that alkali metals, in contrast to the rare gases, are efficiently Penning ionized upon excitation of the (n = 2)-bands of the host droplets.