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Ultrafast all-optical modulation of infrared radiation via metal-semiconductor waveguide structures

机译:通过金属半导体波导结构对红外辐射进行超快全光调制

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摘要

We present a novel optical-optical semiconductor switching technique for application to infrared laser beam modulation and ultrashort infrared laser pulse switching. This method relies on the ultrafast optical excitation, with femtosecond above-bandgap laser radiation, of an air-filled metal-clad semiconductor waveguide. Guided electromagnetic wave analysis combined with time-varying dielectric properties of the semiconductor layer are used to investigate the ultrafast switching speed of the structure. The device is capable of modulation at various infrared wavelengths. In particular, we investigate intensity modulation of the quasi-TE/sub 10/ mode for 10.6-/spl mu/m laser radiation. At an electron-hole photoinjection density of /spl sim/1.8/spl times/10/sup 18/ cm/sup -3/, an extinction ratio of 83 dB is demonstrated. This ratio is significantly higher than that exhibited by current optical-optical semiconductor switches. Potential applications to all-optical Mach-Zehnder metal-clad semiconductor modulators and self-limiting switches are also discussed.
机译:我们提出了一种新颖的光学半导体开关技术,用于红外激光束调制和超短红外激光脉冲开关。此方法依赖于飞秒的带隙以上激光束对充气金属包覆的半导体波导的超快光激发。引导电磁波分析结合半导体层随时间变化的介电特性被用于研究结构的超快开关速度。该设备能够在各种红外波长下进行调制。特别是,我们研究了准TE / sub 10 /模式对10.6- / spl mu / m激光辐射的强度调制。在/ spl sim / 1.8 / spl乘以10 / sup 18 / cm / sup -3 /的电子空穴光注入密度下,消光比为83dB。该比率显着高于当前的光学半导体开关所呈现的比率。还讨论了全光Mach-Zehnder金属包覆半导体调制器和自限位开关的潜在应用。

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