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Broadband optical modulation in a zinc-oxide-based heterojunction via optical lifting

机译:通过光学提升的氧化锌基异质结的宽带光学调制

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Broadband electro-absorptive optical modulation in a zinc-oxide (ZnO)-based heterojunction is demonstrated. The presence of high-density two-dimensional electron gas (2DEG) at the bottom of conduction band offset in a MgZnO-CdZnO heterojunction is shown to exhibit electrically tunable optical absorption in the regions well below the material bandgap. Electrons confined near the heterojunction are lifted across the potential barrier on optical excitation. Optical modulation with an extinction ratio of 8 dB is reported at an operating wavelength of 527 nm. The extinction ratio remains around 7-8 dB over a wide bandwidth of 115 nm, providing an excellent opportunity to explore ZnO-based heterojunctions to realize a broadband optical modulator for applications in optical communication and interconnects. (C) 2020 Optical Society of America
机译:证明了基于氧化锌(ZnO)的异质结的宽带电吸收光学调制。 在MGZNO-CDZNO异质结中的导通带偏移的底部存在高密度二维电子气(2deg)的存在,示出了在材料带隙下方的区域中表现出电动可调谐的光学吸收。 在异质结附近的电子局限于光学激发的潜在屏障上。 在527nm的工作波长下报告具有8dB的消光比的光学调制。 消光比在115 nm的宽带宽度范围内保持大约7-8dB,提供了探索基于ZnO的异质功能的绝佳机会,以实现光学通信和互连中的应用的宽带光学调制器。 (c)2020美国光学学会

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