Critical coupling using the hexagonal boron nitride crystals in the mid-infrared range

Journal Article · Sat May 28 00:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4952578· OSTI ID:22596707

Wu, Jipeng; Wang, Hengliang; Wen, Shuangchun ^[1]; Jiang, Leyong; Guo, Jun; Dai, Xiaoyu ^[2]; Xiang, Yuanjiang ^[1]

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1. Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082 (China)
2. SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060 (China)

We theoretically demonstrate the perfect absorption phenomena in the hexagonal boron nitride (hBN) crystals in the mid-infrared wavelength ranges by means of critical coupling with a one-dimensional photonic crystal spaced by the air. Different from the polymer absorbing layer composed by a metal-dielectric composite film, the hyperbolic dispersion characteristics of hBN can meet the condition of critical coupling and achieve the total absorption in the mid-infrared wavelength ranges. However, the critical coupling phenomenon can only appear in the hBN crystals with the type II dispersion. Moreover, we discuss the influence of the thickness of hBN, the incident angle, and the thickness and permittivity of the space dielectric on the total absorption. Ultimately, the conditions for absorption enhancement and the optimization methods of perfect absorption are proposed, and the design rules for a totally absorbing system under the different conditions are achieved.

• OSTI ID: 22596707
• Journal Information: Journal of Applied Physics, Vol. 119, Issue 20; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
AIR
BORON NITRIDES
COUPLING
CRYSTALS
DIELECTRIC MATERIALS
DISPERSIONS
FILMS
LAYERS
METALS
NEAR INFRARED RADIATION
ONE-DIMENSIONAL CALCULATIONS
OPTIMIZATION
PERMITTIVITY
POLYMERS
THICKNESS
WAVELENGTHS