Two different triple-layer guided-mode resonance(GMR)filters with photonic crystal(PC)slab structures are designed,and their main optical properties are investigated.It is shown that under normal incidence,the PC slab...Two different triple-layer guided-mode resonance(GMR)filters with photonic crystal(PC)slab structures are designed,and their main optical properties are investigated.It is shown that under normal incidence,the PC slab GMR filters exhibit narrower bandwidth,a more symmetric line shape,and larger angular tolerance,compared with the planar grating GMR filters.The rod-slab type GMR filter works better than the hole-slab one.The resonance wavelength location and the angular tolerance can be tuned by varying the periods.The angular tolerance with narrow bandwidth can be improved by increasing the ratio of the periods in the two crossed directions.展开更多
Light extraction effects ora photonic crystal slab with a micrometer scale lattice constant are studied.A GaN light emitting diode(LED)with a photonic crystal slab is fabricated.The light extraction effects and the en...Light extraction effects ora photonic crystal slab with a micrometer scale lattice constant are studied.A GaN light emitting diode(LED)with a photonic crystal slab is fabricated.The light extraction effects and the enhancement mechanism are investigated.From theoretical analysis,it is found that the characteristics of LED light emission are modulated by the photonic crystal slab.Experimental results show that the LED light emission intensity is enhanced by 38%due to guide mode extracting by the photonic crystal.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 60877030,91121019 and 61021003the National High Technology Research and Development Program of China under Grant No 2009AA03Z406.
文摘Two different triple-layer guided-mode resonance(GMR)filters with photonic crystal(PC)slab structures are designed,and their main optical properties are investigated.It is shown that under normal incidence,the PC slab GMR filters exhibit narrower bandwidth,a more symmetric line shape,and larger angular tolerance,compared with the planar grating GMR filters.The rod-slab type GMR filter works better than the hole-slab one.The resonance wavelength location and the angular tolerance can be tuned by varying the periods.The angular tolerance with narrow bandwidth can be improved by increasing the ratio of the periods in the two crossed directions.
基金Supported by the National High Technology Research and Development Program of China under Grant Nos 2008AA03Z402 and 2009AA03Z412the National Natural Science Foundation of China under Grant Nos 60807010,60736037 and 60978067the National Basic Research Program of China under Grant Nos 2009CB320300 and 2010CB934104.
文摘Light extraction effects ora photonic crystal slab with a micrometer scale lattice constant are studied.A GaN light emitting diode(LED)with a photonic crystal slab is fabricated.The light extraction effects and the enhancement mechanism are investigated.From theoretical analysis,it is found that the characteristics of LED light emission are modulated by the photonic crystal slab.Experimental results show that the LED light emission intensity is enhanced by 38%due to guide mode extracting by the photonic crystal.
