中国科学院重庆绿色智能技术研究院机构知识库

QQ客服 官方微博 反馈留言

	Experimental demonstration of an electrically tunable broadband coherent perfect absorber based on a graphene–electrolyte–graphene sandwich structure
	Zhang, J.I.N.1; Wei, Xingzhan2; Premaratne, Malin3; W., Zhu
	2019
摘要	We propose and experimentally demonstrate the operation of an electrically tunable, broadband coherent perfect absorption (CPA) at microwave frequencies by harnessing the CPA features of a graphene–electrolyte–graphene sandwich structure (GSS). Using both a simplified lumped circuit model and full-wave numerical simulation, it is found that the microwave coherent absorptivity of the GSS can be tuned dynamically from nearly 50% to 100% by changing the Fermi level of the graphene. Strikingly, our simplified lumped circuit model agrees very well with the full-wave numerical model, offering valuable insight into the CPA operation of the device. The angle dependency of coherent absorption in the GSS is further investigated, making suggestions for achieving CPA at wide angles up to 80°. To show the validity and accuracy of our theory and numerical simulations, a GSS prototype is fabricated and measured in a C-band waveguide system. The reasonably good agreement between the experimental and the simulated results confirms that the tunable coherent absorption in GSS can be electrically controlled by changing the Fermi level of the graphene. © 2019 Chinese Laser Press.
DOI	10.1364/PRJ.7.000868
发表期刊	Photonics Research
ISSN	23279125
卷号	7期号:8页码:868-874
收录类别	EI
语种	英语