瑞士苏黎世联邦理工学院《Science》:带宽超过500GHz的超材料石墨烯光电探测器
据悉,尽管石墨烯已经展现出许多最初预测的光电、热学和机械性能,但具有大频谱带宽和极高频响应的光电探测器仍然是一个待解决的难题。
原文:
Title: Metamaterial graphene photodetector with bandwidth exceeding 500 gigahertz
Author: Stefan M. Koepfli, Michael Baumann, Yesim Koyaz, Robin Gadola, Arif Güngr, Killian Keller, Yannik Horst, Shadi Nashashibi, Raphael Schwanninger, Michael Doderer, Elias Passerini, Yuriy Fedoryshyn, Juerg Leuthold
Issue&Volume: 2023-06-16
Abstract: Although graphene has met many of its initially predicted optoelectronic, thermal, and mechanical properties, photodetectors with large spectral bandwidths and extremely high frequency responses remain outstanding. In this work, we demonstrate a >500 gigahertz, flat–frequency response, graphene-based photodetector that operates under ambient conditions across a 200-nanometer-wide spectral band with center wavelengths adaptable from <1400 to >4200 nanometers. Our detector combines graphene with metamaterial perfect absorbers with direct illumination from a single-mode fiber, which breaks with the conventional miniaturization of photodetectors on an integrated photonic platform. This design allows for much higher optical powers while still allowing record-high bandwidths and data rates. Our results demonstrate that graphene photodetectors can outperform conventional technologies in terms of speed, bandwidth, and operation across a large spectral range.
DOI: adg8017
Source: https://www.science.org/doi/10.1126/science.adg8017
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