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Micromachines 2011, 2(2), 150-156; doi:10.3390/mi2020150

Focusing Light with Curved Guided-Mode Resonance Reflectors

1,* , 2
1 Department of Electrical Engineering, University of Texas at Arlington, 416 Yates Street, Arlington, TX 76019, USA 2 School of Electronic Engineering, Xidian University, Xi’an, Shannxi 710071, China
* Author to whom correspondence should be addressed.
Received: 2 March 2011 / Revised: 12 April 2011 / Accepted: 14 April 2011 / Published: 28 April 2011
(This article belongs to the Special Issue Nano-photonic Devices)
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Employing numerical simulations, we investigate the possibility of using curved guided-mode resonance (GMR) elements to focus light in reflection. We treat GMR reflectors with a parabolic shape and show that they are capable of focusing light effectively across wavelength bands that extend several hundred nanometers. The spatially infinite reflector model is simulated with a finite-element method, whereas the spatially finite reflector is treated with a finite-difference-time-domain method. The numerical results demonstrate that light intensity at the focal point is 8.6 dB stronger than the incident intensity when the GMR reflector’s size is on the order of 10 wavelengths. The results indicate potential applicability of wideband-focusing devices in electromagnetics and photonics using compact resonance elements.
Keywords: diffraction gratings; reflectors; guided waves; leaky modes diffraction gratings; reflectors; guided waves; leaky modes
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Lu, M.; Zhai, H.; Magnusson, R. Focusing Light with Curved Guided-Mode Resonance Reflectors. Micromachines 2011, 2, 150-156.

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