Enhanced superprism effect in symmetry reduced photonic crystals

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We propose compact S-vector superprism providing broadband wavelength sensitivity within a/lambda= 0.610-0.635, where "a" is the lattice constant, lambda is the incident wavelength, and S denotes the Poynting vector. The reported configuration overcomes strong beam divergence and complex beam generation due to the self-collimation ability of the low symmetric primitive photonic crystal (PhC) cells. Analytical calculations of equi-frequency contours, photonic band structures, and group velocity dispersions are performed by solving Maxwell's equations and using the plane wave expansion method. Besides, finite-difference time-domain analyses are also conducted. The designed superprism induces large refracted angle variation for different frequencies when the incident angle is fixed: 4% change of incident frequencies results in approximately 40 degrees deflected angle difference with a maximum 68.9 degrees deflection angle inside the PhC. Meanwhile, for a fixed incident wavelength, a large output variation occurs if the incident angle is altered. Microwave experimental results are found to be in good agreement with the numerical analyses. Published by AIP Publishing.
Publisher
AMER INST PHYSICS
Issue Date
2018-09
Language
English
Article Type
Article
Citation

APPLIED PHYSICS LETTERS, v.113, no.13

ISSN
0003-6951
DOI
10.1063/1.5032197
URI
http://hdl.handle.net/10203/282649
Appears in Collection
EE-Journal Papers(저널논문)
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