Ultrafast all-optical switching in a silicon-based photonic crystal

被引：180
|
作者：
Haché, A [1 ]
Bourgeois, M [1 ]
机构：
[1] Univ Moncton, Dept Phys & Astron, Moncton, NB E1A 3E9, Canada
来源：
APPLIED PHYSICS LETTERS | 2000年 / 77卷 / 25期
关键词：
D O I：
10.1063/1.1332823
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We study the effect of two-photon absorption and Kerr nonlinearity on the optical properties of a one-dimensional photonic crystal made with amorphous silicon and SiO2. A stop band appearing near 1.5 mum is monitored with a weak probe beam and modulated by changes in the refractive index caused by a pump pulse at 1.71 mum with 18 GW/cm(2) peak intensity. Nonlinear optical characterization of the sample using Z-scan points out to two-photon absorption as the main contributor to free carrier excitation in silicon at that power level. Modulation in the transmittance near the band edge is found to be dominated by the optical Kerr effect within the pulse overlap (similar to 400 fs) whereas free carrier index changes are observed for 12 ps. (C) 2000 American Institute of Physics. [S0003-6951(00)02551-1].
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页码：4089 / 4091
页数：3
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