Study of Design Tunable Optical Sensor and Monochromatic Filter of the One-Dimensional Periodic Structure of TiO 2 /MgF
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Study of Design Tunable Optical Sensor and Monochromatic Filter of the One-Dimensional Periodic Structure of TiO2/MgF2 with Defect Layer of Liquid Crystal (LC) Sandwiched with Two Silver Layers Pawan Singh 1 & Khem B. Thapa 1
&
Sudesh K. Singh 2 & Alok K. Gupta 3
Received: 19 December 2019 / Accepted: 1 June 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this paper, we have inspected the optical characteristics of one-dimensional periodic structure (1DPS) of TiO2 and MgF2 dielectric materials with defect layer of liquid crystal (LC) sandwiched with two silver layers, i.e., (TiO2|MgF2)3|Ag|LC|Ag|(TiO2/MgF2)3 using transfer matrix method (TMM). The optical tunable properties of considered periodic structures investigated at different incident angles and temperatures for TE and TM modes. Our study shows that absorption peak of 1DPS varies with incident angle and temperature. The defect layer (Ag-LC-Ag), sandwiched LC within two metallic (Ag) layers, exhibits the surface plasmon waves at the metal LC interfaces. The effect of surface plasmon waves can be better understand through the optical sensing property of such defect periodic structure. The detailed study concludes that such a type of one-dimensional periodic structure (1DPS) may be useful to design a tunable sensor and monochromatic filter. Keywords Optical properties . Transfer matrix method (TMM) . Silver (Ag) . Liquid crystal . Surface plasmon resonance
Introduction In inference to control the electromagnetic wave, photonic crystals are the interesting optical medium, which controls the propagation of electromagnetic wave inside periodic dielectric layers. Photonic crystals (PCs) are the regular arrangement of dielectric slabs in different dimensions with periodical repetition of dielectric functions. Such periodic structures show novel properties on the interaction of the electromagnetic field with the matter. Including controlled transmission, PCs exhibit photonic band gap (PBG) regions, which block the flow of the electromagnetic wave. In point of view of the dielectric function, PCs are divided into three classes: onedimensional photonic crystal (1DPC), two-dimensional * Khem B. Thapa [email protected] 1
Department of Physics, School of Physical and Decision Sciences, Babasaheb Bhimrao Ambedkar University, Vidya Vihar, Raebareli Road, Lucknow, U.P 226025, India
2
Department of Physics, T.D.P.G. College, Jaunpur, U.P. 222002, India
3
Ministry of Human Resource Development, Government of India, National Institute of Open Schooling, Regional Centre, Kochi 682036, India
photonic crystal (2DPC), and three-dimensional photonic crystal (3DPC). PCs have various applications based on the desired application, e.g., optical filters, switches, and omnidirectional reflectors [1–11]. Based on omnidirectional characteristics, PCs show different applications in optical devices. Optical devices such as microwave absorbers and sensors can be fabricated based on absorption characteristics of photonic crystals with the metal
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