Diffraction inspired unidirectional and bidirectional beam splitting in defect-containing photonic structures without interface corrugations
- Electrical Engineering Department, Ankara University, Golbasi, 06830 Ankara (Turkey)
- Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 61002 Kharkiv (Ukraine)
- Nanotechnology Research Center—NANOTAM, Bilkent University, 06800 Ankara (Turkey)
It is shown that strong diffractions and related dual-beam splitting can be obtained at transmission through the nonsymmetric structures that represent two slabs of photonic crystal (PhC) separated by a single coupled-cavity type defect layer, while there are no grating-like corrugations at the interfaces. The basic operation regimes include unidirectional and bidirectional splitting that occur due to the dominant contribution of the first positive and first negative diffraction orders to the transmission, which is typically connected with different manifestations of the asymmetric transmission phenomenon. Being the main component of the resulting transmission mechanism, diffractions appear owing to the effect exerted by the defect layer that works like an embedded diffractive element. Two mechanisms can co-exist in one structure, which differ, among others, in that whether dispersion allows coupling of zero order to a wave propagating in the regular, i.e., defect-free PhC segments or not. The possibility of strong diffractions and efficient splitting related to it strongly depend on the dispersion properties of the Floquet-Bloch modes of the PhC. Existence of one of the studied transmission scenarios is not affected by location of the defect layer.
- OSTI ID:
- 22596700
- Journal Information:
- Journal of Applied Physics, Vol. 119, Issue 19; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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