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Palai G.,Gandhi Institute for Technological Advancement GITA | Tripathy S.K.,National Institute of Science and Technology NIST
Optics Communications | Year: 2012

A novel method to measure the concentration of sugar, sodium chloride and alcohol, in their aqueous solution by using two dimensional photonic crystal structures is presented. This measurement is very accurate as the principle is based on variation of photonic band gap with respect to concentration. Photonic band gap here is computed using plane wave expansion method. © 2012 Elsevier B.V. All rights reserved.


This paper presents the realization of optical mirror using 3D photonic crystals structure with the help of photonic bandgap analysis. The photonic bandgap is simulated using plane wave expansion method. Theoretical result revealed that both lattice spacing of structure and radius of air holes play vital role to discuss mirror application. Aside this, simulation result showed that no band gap exists in the same structure, if lattice constant is either less than 0.83 μm or more than 1.27 μm. So the mirror application is suitable for lattice constant that lies between 0.83 μm and 1.27 μm. © 2015 Elsevier GmbH. All rights reserved.


Palai G.,Gandhi Institute for Technological Advancement GITA | Tripathy S.K.,National Institute of Science and Technology NIST | Sahu T.,National Institute of Science and Technology NIST
Optik | Year: 2014

We propose a novel technique to measure the concentration of sucrose in PAm-hydrogel sucrose solution using two dimensional photonic crystal structures consists of air holes. PAm-hydrogel is an organic hydrogels, which is used as biomedical applications. The principle of measurement is based on the linear variation of photonic band gap with the change of dielectric constant of the solution infiltrated in air holes of photonic crystal structure. Plane wave expansion method is used to find the band gap and linear variation (R 2 = 0.9949) of photonic band gap with respect to sucrose concentration is observed. Besides this, an excellent linear variation (R 2 = 0.9949) of transmitted intensity of light with respect to sucrose concentration is also seen. Since the simulation is based on optical principle, it gives accurate results. This suggests the possible use of 2-D photonic crystal structure as a sucrose sensor. Experimental procedure for measuring the concentration of sucrose is also mentioned. © 2013 Elsevier GmbH.


Palai G.,Gandhi Institute for Technological Advancement GITA
Optik | Year: 2014

Owing to temperature is important for both elemental and compound semiconductor to study various properties, this paper presents a novel technique to measure the temperature in semiconductor at wavelength, 10.59 μm using optical principle. Here both reflection and absorption losses are considered to find out temperature in semiconductor. Reflectance is found using plane wave expansion method, where absorption factor is determined using Maxwell's curl equations. Simulation result reveals that reflectance and transmitted intensity vary linearly with respect to different temperatures. Apart from this, it is also seen that absorbance is zero for all semiconductor at wavelength 10.59 μm. The excellent linear variation of transmitted intensity gives an accurate measurement of temperature in semiconductors at aforementioned wavelength. © 2014 Elsevier GmbH. All rights reserved.


Palai G.,Gandhi Institute for Technological Advancement GITA
Optik | Year: 2016

This paper investigates the structure, operation and simulation of Optical Waveguide for Optical Demultiplexer (DEMUX) at three optical communication windows. Optical waveguide is realized by 2D photonic crystal structure with 3 × 3 silicon rod. Photonic band gap of 2D photonic crystal structure is simulated by plane wave expansion method. Here, two types of reflections, external and internal are considered to obtain the photonic band gap. Simulation results reveal that lattice parameter and diameter of silicon rod play vital role to design the optical Demultiplexer. Again, this result showed that photonic crystal having diameter of silicon rod of 129 nm and lattice spacing of 428 nm allows wavelength, 850 nm, diameter 97 nm and 194 nm allows wavelength, 1310 nm, diameter 36 nm and lattice spacing of 180 allows wavelength, 1550 nm. © 2015 Elsevier GmbH. All rights reserved.

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