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Kumar A.,Amity University | Kumar V.,P.A. College | Suthar B.,Government Dungar College | Suthar B.,Government College of Engineering and Textile Technology , Berhampore | And 3 more authors.
IEEE Photonics Technology Letters | Year: 2013

Theoretical studies on the group velocity of light wave in 1-D polystyrene/SiO2 nonlinear photonic crystal is investigated. The speed of light wave through these multilayered structures is calculated in the absence as well as in the presence of a high intensity controlling wave by using the transfer matrix method. This letter shows that we can trap a light wave inside the nonlinear 1-D photonic crystal by switching off the controlling wave. © 2012 IEEE.


Suthar B.,Government College of Engineering and Textile Technology , Berhampore | Kumar V.,P.A. College | Kumar A.,Amity University | Singh K.S.,P.A. College | Bhargava A.,Government Dungar College
Progress in Electromagnetics Research Letters | Year: 2012

The effect of temperature on the photonic band gap has been investigated. One dimensional photonic crystal in the form of Si/air multilayer system has been studied in this communication. The refractive index of silicon layers is taken as a function of temperature and wavelength both. Therefore, this study may be considered to be physically more realistic. It may be useful for computing the optical properties for wider range of wavelength as well as temperature. We can use the proposed structure as temperature sensing device, narrow band optical filter and in many optical systems.


Kumar A.,Amity University | Suthar B.,Government College of Engineering and Textile Technology , Berhampore | Kumar V.,P.A. College | Singh K.S.,P.A. College | Bhargava A.,Government Dungar College
Progress in Electromagnetics Research Letters | Year: 2012

Transmission characteristics of 1-D photonic crystal (PC) structure with a defect have been studied. We consider a Si/ZnS multilayer system. We also consider the refractive index of both layers to be dependent on temperature and wavelength simultaneously. The refractive indices of Si and ZnS layers are functions of temperature as well in the wavelength of incident light. This property can be used while tuning defect modes at desired wavelength. As defect modes are function of temperature, one can tune the defect modes to desired wavelength. It is found that the average change in central wavelength of each defect mode is 0.07 nm/K. This property can be exploited in the design of a tunable wavelength demultiplexer for DWDM application in optical communication.


Kumar V.,P.A. College | Suthar B.,Government College of Engineering and Textile Technology , Berhampore | Kumar A.,Amity University | Singh K.S.,P.A. College | Bhargava A.,Government Dungar College
Optik | Year: 2013

Transmission characteristics of one-dimensional photonic crystal structure with a defect have been studied. We consider a Si/air multilayer system. We also consider the refractive index of Si layer to be dependent on temperature and wavelength simultaneously. Central wavelength of the defect mode depends on the width of the defect layer, so we can change the central wavelength of defect mode by changing the width of defect layer. This property can be exploited in the designing of wavelength division demultiplexer for optical communication. © 2012 Elsevier GmbH.


Kumar V.,P.A. College | Suthar B.,Government Engineering College | Kumar A.,Amity University | Singh K.S.,P.A. College | Bhargava A.,Government Dungar College
Physica B: Condensed Matter | Year: 2013

The effect of temperature and angle of incidence on photonic band gaps (PBGs) in a dispersive Si-based one dimensional photonic crystal consisting of alternate layers of silicon and air has been investigated. More physically realistic situation is considered by taking the refractive index of silicon layers as a function of temperature and wavelength. The effect of temperature and angle of incidence on reflection spectra of proposed structure for TE polarization has also been studied. The PBG can be tuned by varying the temperature of the geometry or by changing the angle of incidence. The propagation characteristics of the proposed structure are analyzed using transfer matrix method.


Suthar B.,Government Engineering College | Bhargava A.,Government Dungar College
Silicon | Year: 2015

In the present communication, the optical properties of a one-dimensional plasma photonic crystal (PPC) containing alternate dielectric and plasma layers has been studied. The photonic band structure, reflection spectra and group velocity of such photonic crystals have been presented. It is found that the photonic bandgap can be increased with the thickness of plasma layers and group velocity reaches negative values at a certain frequency. © 2015, Springer Science+Business Media Dordrecht.


Bhargava A.,Government Dungar College | Suthar B.,Government Engineering College
AIP Conference Proceedings | Year: 2013

Photonic crystals (PC) are a promising platform for realizing compact all-optical switches operating at very low power and integrated on an optical integrated circuit. Photonic crystals prepared from a highly nonlinear chalcogenide material appears to be a promising architecture for confining and guiding light at the wavelength scale, where the Kerr nonlinearity and photo sensitivity of the material can be exploited to achieve a new range of compact integrated devices. The present paper examines the theoretical work relating to the Chalcogenide PhC when the layers are tailored by defects to generate localized modes. The work is particularly useful in the design and development of photonic devices. © 2013 AIP Publishing LLC.


Suthar B.,Government Dungar College | Bhargava A.,Government Dungar College
Progress in Electromagnetics Research Letters | Year: 2011

In the present study, we show that it is possible to achieve multi-channel filters in one-dimensional photonic crystals using photonic quantum well structures. The photonic quantum well structure consists of different 1-D photonic structures. We use (AB)8/Cn/(BA)8 structure, where A, B and C are different materials. The number of defect layers (C) can be utilized to tune the multi- channel filtering. The filter range can be tuned for desired wavelength with the change in angle of incidence for multi-channel filtering.


Suthar B.,Government Dungar College | Bhargava A.,Government Dungar College
Optics Communications | Year: 2012

We study 1-D photonic crystal in which alternate layers are of materials like chalcogenide As 40Se 60 - xS x and silica. For our three different structures, namely AB, CD and EF in which the refractive index contrast as well as the filling factor is different. Another structure (AB)/(CD)/(EF) which is a combination of earlier multilayer systems has also been considered to study the effect of cascading. Transfer matrix method is used to calculate the omni-directional reflectivity of each multilayer system and omni-directional photonic band gaps (PBGs). We found that large range of omni-directional PBG can be obtained by cascading chalcogenide As 40S 60 - xSe x/silica system. © 2011 Elsevier B.V. All rights reserved.


Suthar B.,Government Dungar College | Kumar V.,P.A. College | Singh K.S.,P.A. College | Bhargava A.,Government Dungar College
Optics Communications | Year: 2012

A simple design of one dimensional gradual stacked photonic crystal (GSPC) structure has been proposed. The proposed structure, based on chalcogenide material, consists of a periodic array of alternate layers of As 2S 3 and air as the materials of high and low refractive indices respectively. The structure considered here has three stacks of periodic structures, each having five unit cells. The lattice period of successive stack is increased/decreased by a certain multiple (say gradual constant, e γ) of the lattice period of the just preceding stack. For numerical computation, the transfer matrix method (TMM) has been employed. It is found that such a structure has wider reflection bands in comparison to a conventional dielectric PC structure, and the width of reflection bands can be enlarged as well as shifted towards higher/lower frequency by increasing/decreasing the value of the gradual constant. Hence, a GSPC structure can be used for broadening as well as tuning the photonic band gap and the bandwidth of gaps can be tuned to a desired wavelength region by choosing appropriate value of γ (positive or negative). © 2011 Elsevier B.V. All rights reserved.

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