What is it about?
How to achieve flexible light control in an optical structure for the needs of photonics? We propose the three-periodic stack structure (photonic crystal) which composed of four different layers (dielectric oxides Al2O3, SiO2, TiO2, and ZrO2)
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Why is it important?
We analyze the transmittivity spectra of near-infrared light which goes through the structures in the vicinity of the so called photonic bandgaps (wherein the light can be "stoppped"). The structure actually consists of sub-cells (there are N of one pair "ab"and M of the other pair "cd") and super-cells (K of them). It turns out a great flexibility in the control of light can be achieved by variations of the cell numbers (N, M and K), the incidence angle, and the order of the layers in the structure. We propose a convinient classification of three-periodic photonic crystals by the magnitude and sign of the optical contrast (i.e. difference of refractive indices) between the layers in pairs (ab) and (cd) forming the sub-cells. Due to this, one can choose structures with predictable properties.
Perspectives
Such optical structures are suitable for creation of the multifunctional integrated optical circuits, and the obtained results can help with the design of nanophotonic devices, including omnidirectional reflectors, optical narrow-band filters, antireflective coatings for photovoltaics, and ultrasensitive angle sensors.
Dmitry G Sannikov
Ulyanovsk State University
Read the Original
This page is a summary of: One-dimensional multiperiodic photonic structures: A new route in photonics (four-component media), Journal of Applied Physics, September 2019, American Institute of Physics,
DOI: 10.1063/1.5115829.
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