期刊
OPTICS EXPRESS
卷 17, 期 18, 页码 16358-16365出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.17.016358
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We propose a new class of optoelectronic devices in which the optical properties of the active material is enhanced by strain generated from micromechanical structures. As a concrete example, we modeled the emission efficiency of strained germanium supported by a cantilever-like platform. Our simulations indicate that net optical gain is obtainable even in indirect germanium under a substrate biaxial tensile strain of about 1.5% with an electron-hole injection concentration of 9x10(18) cm(-3) while direct bandgap germanium becomes available at a strain of 2%. A large wavelength tuning span of 400 nm in the mid-IR range also opens up the possibility of a tunable on-chip germanium biomedical light source. (C) 2009 Optical Society of America
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