Colour selective control of terahertz radiation using two-dimensional hybrid organic inorganic lead-trihalide perovskites

	Colour selective control of terahertz radiation using two-dimensional hybrid organic inorganic lead-trihalide perovskites
	Chanana, Ashish 1; Zhai, Yaxin 2; Baniya, Sangita 2; Zhang, Chuang 2,3; Vardeny, Z. Valy 2; Nahata, Ajay 1
刊名	NATURE COMMUNICATIONS
	2017-11-06
卷号	8
英文摘要	Controlling and modulating terahertz signals is of fundamental importance to allow systems level applications. We demonstrate an innovative approach for controlling the propagation properties of terahertz (THz) radiation, through use of both the excitation optical wavelength (colour) and intensity. We accomplish this using two-dimensional (2D) layered hybrid trihalide perovskites that are deposited onto silicon substrates. The absorption properties of these materials in the visible range can be tuned by changing the number of inorganic atomic layers in between the organic cation layers. Optical absorption in 2D perovskites occurs over a broad spectral range above the bandgap, resulting in free carrier generation, as well as over a narrow spectral range near the bandedge due to exciton formation. We find that only the latter contribution gives rise to photo-induced THz absorption. By patterning multiple 2D perovskites with different optical absorption properties onto a single device, we demonstrate both colour selective modulation and focusing of THz radiation. These findings open new directions for creating active THz devices.
语种	英语
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/39125]
专题	化学研究所_光化学实验室
作者单位	1.Univ Utah, Dept Elect & Comp Engn, 50 S Cent Campus Dr, Salt Lake City, UT 84112 USA 2.Univ Utah, Dept Phys & Astron, 115 S 1400 East, Salt Lake City, UT 84112 USA 3.Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Chanana, Ashish,Zhai, Yaxin,Baniya, Sangita,et al. Colour selective control of terahertz radiation using two-dimensional hybrid organic inorganic lead-trihalide perovskites[J]. NATURE COMMUNICATIONS,2017,8.
APA	Chanana, Ashish,Zhai, Yaxin,Baniya, Sangita,Zhang, Chuang,Vardeny, Z. Valy,&Nahata, Ajay.(2017).Colour selective control of terahertz radiation using two-dimensional hybrid organic inorganic lead-trihalide perovskites.NATURE COMMUNICATIONS,8.
MLA	Chanana, Ashish,et al."Colour selective control of terahertz radiation using two-dimensional hybrid organic inorganic lead-trihalide perovskites".NATURE COMMUNICATIONS 8(2017).