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Two‐color pump–probe experiments on silicon inverse opals
Author(s) -
Becker C.,
Linden S.,
von Freymann G.,
Tétreault N.,
Vekris E.,
Kitaev V.,
Ozin G. A.,
Wegener M.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200668059
Subject(s) - picosecond , materials science , silicon , inverse , excitation , refractive index , optics , relaxation (psychology) , drude model , transient (computer programming) , molecular physics , optoelectronics , physics , laser , psychology , social psychology , geometry , mathematics , quantum mechanics , computer science , operating system
We present time‐resolved pump–probe experiments in a transmission geometry using off‐resonant excitation on very high‐quality silicon inverse opals. We show that the nonlinear optical response can drastically be modified by tempering of the sample. The as‐grown samples are dominated by an absorptive response with recovery times as short as one picosecond. For the tempered samples, both the relaxation and the scattering times increase, leading to a prominent dispersive response. The data reveal a transient blue‐shift of the fundamental stop band on the order of 150 nm with transmission changes as large as a factor of five. Based on simple calculations using the Drude model we estimate corresponding refractive index changes as large as Δ n = –0.5 + i0.07. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)