Plasmon-Enhanced below Bandgap Photoconductive Terahertz Generation and Detection

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• 作者：Afshin Jooshesh ; Vahid Bahrami-Yekta ; Jinye Zhang ; Thomas Tiedje ; Thomas E. Darcie ; Reuven Gordon
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：December 9, 2015
• 年：2015
• 卷：15
• 期：12
• 页码：8306-8310
• 全文大小：396K
• ISSN：1530-6992

文摘

We use plasmon enhancement to achieve terahertz (THz) photoconductive switches that combine the benefits of low-temperature grown GaAs with mature 1.5 渭m femtosecond lasers operating below the bandgap. These below bandgap plasmon-enhanced photoconductive receivers and sources significantly outperform commercial devices based on InGaAs, both in terms of bandwidth and power, even though they operate well below saturation. This paves the way for high-performance low-cost portable systems to enable emerging THz applications in spectroscopy, security, medical imaging, and communication.