Journal
OPTICS LETTERS
Volume 39, Issue 5, Pages 1137-1140Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.39.001137
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Funding
- National Natural Science Foundation of China [61275030, 61205030, 61235007]
- Qianjiang River Fellow Fund of Zhejiang Province
- Scientific Research Foundation for the Returned Overseas Chinese Scholars from the State Education Ministry
- Opened Fund of State Key Laboratory of Advanced Optical Communication Systems and Networks
- Fundamental Research Funds for the Central Universities
- Doctoral Fund of Ministry of Education of China [20120101120128]
- Zhejiang Provincial Funding for the Key Discipline of Optics
- Swedish Foundation for Strategic Research (SSF)
- Swedish Research Council (VR)
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Lamellar gratings are investigated via temporal coupled-mode theory and numerical simulations. Total absorption can be achieved by an optimized grating with shallow grooves under normal incidence and the full width at half-maximum (FWHM) is only 0.4 nm. For certain wavelengths, the structure shows high absorption only within an ultra-narrow angle, which suggests that it can be used as a highly directional thermal emitter according to Kirchhoff's law. Besides, the resonant wavelength is sensitive to the refractive index of the environmental dielectric. The large sensitivity (1400 nm/RIU) and simultaneous small FWHM result in a huge figure-of-merit of 2300/RIU, which enables the structure to have great potential in plasmonic sensing. (C) 2014 Optical Society of America
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