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Title: Two-Dimensional Hybrid Photonic Crystal With Graded Low-Index Using a Nonuniform Voltage
Authors: Rezaei, Behrooz
Giden, İbrahim Haiii
Zakerhamidi, Mohammad Sadegh
Ranjkesh, Amid
Yoon, Tae-Hoon
Keywords: Focal Distance Tuning
Graded Index Optics
Liquid Crystal
Optical Beam Focusing
Photonic Crystal
Issue Date: 2020
Publisher: Walter De Gruyter Gmbh
Abstract: We proposed a new method for designing graded index lens using liquid crystal infiltration into annular photonic crystals. Applying an external nonuniform voltage in the transverse direction perpendicular to the direction of light propagation yields different orientation of liquid crystal molecules inside the photonic crystal unit cells. As a result, a gradient refractive index was modulated. We numerically investigate focusing properties of the designed graded index structure using plane-wave expansion and finite-difference time-domain methods. The gradient refractive index profile was adjusted by varying the nonuniform voltage excitations, which consequently altered the focal distance of the graded index structure. A wide tuning range of 1856 nm was achieved for focal distance by the proposed graded index structure. This feature can be implemented for planning a flat lens with tunable focal distance based on electro-optic effect. These achievements may have future applications in some optical devices such as near-field imaging and scanning.
ISSN: 0932-0784
Appears in Collections:Elektrik ve Elektronik Mühendisliği Bölümü / Department of Electrical & Electronics Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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