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Focusing Light with Curved Guided-Mode Resonance Reflectors
Department of Electrical Engineering, University of Texas at Arlington, 416 Yates Street, Arlington, TX 76019, USA
School of Electronic Engineering, Xidian University, Xi’an, Shannxi 710071, China
* Author to whom correspondence should be addressed.
Received: 2 March 2011; in revised form: 12 April 2011 / Accepted: 14 April 2011 / Published: 28 April 2011
Abstract: 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
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MDPI and ACS Style
Lu, M.; Zhai, H.; Magnusson, R. Focusing Light with Curved Guided-Mode Resonance Reflectors. Micromachines 2011, 2, 150-156.
Lu M, Zhai H, Magnusson R. Focusing Light with Curved Guided-Mode Resonance Reflectors. Micromachines. 2011; 2(2):150-156.
Lu, Mingyu; Zhai, Huiqing; Magnusson, Robert. 2011. "Focusing Light with Curved Guided-Mode Resonance Reflectors." Micromachines 2, no. 2: 150-156.