Please use this identifier to cite or link to this item: https://doi.org/10.1364/OE.19.008610
Title: Gain-assisted transformation optics
Authors: Han, T.
Qiu, C.-W. 
Hao, J.
Tang, X.
Zouhdi, S.
Issue Date: 25-Apr-2011
Source: Han, T., Qiu, C.-W., Hao, J., Tang, X., Zouhdi, S. (2011-04-25). Gain-assisted transformation optics. Optics Express 19 (9) : 8610-8615. ScholarBank@NUS Repository. https://doi.org/10.1364/OE.19.008610
Abstract: Loss severely degrades the cloaking effect of the device designed by traditional transformation. In this letter, we propose gain-assisted transformation optics to overcome the loss problem by introducing gain media into a spherical cloak. The gain media, which can amplify the electromagnetic fields, is controlled precisely to compensate the inherent loss in experimental realization of cloaks. We discuss the significance of controlling embedded gain materials in the context of the inverse design mechanism, which allows us to wisely select realizable materials with constant gain and loss along the radius. For practical realizations, isotropic spherical gain-assisted cloak is designed. Full-wave simulations validate the proposed design concept, which can be utilized to alleviate the inevitable loss problem in transformational optical devices. © 2011 Optical Society of America.
Source Title: Optics Express
URI: http://scholarbank.nus.edu.sg/handle/10635/56109
ISSN: 10944087
DOI: 10.1364/OE.19.008610
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