一、题目：Efficient light outcoupling enhancement using hyperbolic dispersion and asymmetric approach

二、主讲人：Muhammad Imran

三、时间：2019年9月26日（星期四）下午14：00

四、地点：闻理园A4-222

内容摘要：In principle, type-II hyperbolic metamaterials (HMMs) cannot couple to waves traveling in the out-of-plane direction due to momentum conservation. Gratings have been proposed as a means to enhance the outcoupling efficiency, either with a “bulls-eye” structure or more recently as an array of nanoholes. To mitigate some of the short-comings of HMMs, we look forward a new method to outcouple high-k waves along the out-of-plane and propose a new asymmetric hyperbolic structure to allow for the engineering of outcoupling properties. The effective response of the entire HMM provide a drastic Purcell enhancement and enhance the emitter’s spontaneous emission rate. We subsequently investigate that coupling behavior is associated with the flexible control of the angle of the dispersion of HMM.

主讲人简介：Muhammad Imran recently completed his doctoral degree from the Institute of Marine Electronics Engineering and Electromagnetics Academy at Zhejiang University in Hangzhou China. His current research interests are in the areas of Photonics, Graphene plasmonics, Hyperbolic metamaterials, and Optoelectronic devices. His research work has been published in well reputed SCI journals such as, Optics Express, Optics Communications and Nanoscale. In 2018 he got the title of Excellent International student of Ocean college, Zhejiang university.

参考文献：

[1]. Paul R. West et al, Adiabatically Tapered Hyperbolic Metamaterials for dispersion control of high-k waves, Nano lett. 15, 498 (2015).

[2]. Lorenzo Ferrari et al, Hyperbolic metamaterials for dispersion-assisted directional light emission, Nanoscale 9, 9034 (2017).

[3]. Muhammad Imran et al, Harnessing graphene-hBN hyperstructure for single-photon sources, Opt. Express 27, 16461 (2019).

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