14 October 2004 Tuning 2D photonic crystals
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We demonstrate three ways in which the optical band-gap of 2-D macroporous silicon photonic crystals can be tuned. In the first method the temperature dependence of the refractive index of an infiltrated nematic liquid crystal is used to tune the high frequency edge of the photonic band gap by up to 70 nm for H-polarized radiation as the temperature is increased from 35 to 59°C. In a second technique we have optically pumped the silicon backbone using 150 fs, 800 nm pulses, injecting high density electron hole pairs. Through the induced changes to the dielectric constant via the Drude contribution we have observed shifts upt to 30 nm of the high frequency edge of the E-polarized band-gap. Finally, we show that below-band-gap radiation at 2.0 and 1.7 μm can induce changes to the optical properties of silicon via the Kerr effect and tune the band edges of the 2-D macroporous silicon photonic crystal.
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Henry M. van Driel, Henry M. van Driel, Stephen W. Leonard, Stephen W. Leonard, Hong-Wee Tan, Hong-Wee Tan, A. Birner, A. Birner, J. Schilling, J. Schilling, Stefan L. Schweizer, Stefan L. Schweizer, Ralf B. Wehrspohn, Ralf B. Wehrspohn, Ulrich Gosele, Ulrich Gosele, "Tuning 2D photonic crystals", Proc. SPIE 5511, Tuning the Optical Response of Photonic Bandgap Structures, (14 October 2004); doi: 10.1117/12.559914; https://doi.org/10.1117/12.559914

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