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About

I am working as a post doctoral fellow at the Center of Applied Photonics, INESCTEC, Porto, Portugal. I have recieved my M.Sc. degree in Physics with specialization in Electronics from University of Allahabad, Allahabad, Uttar Pradesh, India in 2011.  I have obtained my Ph.D degree in the area of Optical Fiber on the topic "Designing and Analysis of photonic Crystal Fiber for Various Applications" from the Department of Applied Physics, Indian Institute of Technology (Indian School of Mines) , Dhanbad in August 2017. My research Focuses on the design and analysis of different type and fabrication and charaterziation of fiber bragg grating and long period grating for sensing applications.

Interest
Topics
Details

Details

  • Nationality

    Índia
  • Centre

    Applied Photonics
  • Contacts

    +351220402301
    rahul.gangwar@inesctec.pt
Publications

2017

Highly non-linear simple designed solid core photonic crystal fiber

Authors
De, M; Gangwar, RK; Singh, VK;

Publication
Springer Proceedings in Physics

Abstract
A highly non-linear solid core photonic crystal fiber (SCPCF) is designed in the present work. Three hexagonal air hole rings in cladding region and four very small air holes are present in a symmetric manner in the core region. By using full vectorial finite element method (FVFEM) with the perfectly matched layer, we study numerically the effective area of modal pattern as well as the nonlinear coefficient of this proposed SCPCF. For this proposed fiber a small modal effective area 5.58 µm2 and a high nonlinear coefficient 21.38 W-1 km-1 are obtained at communication wavelength 1.55 µm for the small air holes in the core with diameter 0.15 µm. This type of SCPCF is useful for different nonlinear applications. © Springer Nature Singapore Pte Ltd. 2017.

2017

Highly Sensitive Surface Plasmon Resonance Based D-Shaped Photonic Crystal Fiber Refractive Index Sensor

Authors
Gangwar, RK; Singh, VK;

Publication
Plasmonics

Abstract
In this article, a D-shaped photonic crystal fiber based surface plasmon resonance sensor is proposed for refractive index sensing. Surface plasmon resonance effect between surface plasmon polariton modes and fiber core modes of the designed D-shaped photonic crystal fiber is used to measure the refractive index of the analyte. By using finite element method, the sensing properties of the proposed sensor are investigated, and a very high average sensitivity of 7700 nm/RIU with the resolution of 1.30 × 10-5 RIU is obtained for the analyte of different refractive indices varies from 1.43 to 1.46. In the proposed sensor, the analyte and coating of gold are placed on the plane surface of the photonic crystal fiber, hence there is no necessity of the filling of voids, thus it is gentle to apply and easy to use. © 2016, Springer Science+Business Media New York.

2017

Designing of highly birefringence, dispersion shifted decagonal photonic crystal fiber with low confinement loss

Authors
De, M; Gangwar, RK; Singh, VK;

Publication
Photonics and Nanostructures - Fundamentals and Applications

Abstract
In this article we propose a decagonal photonic crystal fiber (D-PCF) consisting unique cladding without structural complexity having very high birefringent of the order of 10-2, less effective area of few square microns as well as low confinement loss of the order of 10-2 dB/m at 1.55 µm wavelength. The zero dispersion wavelength is also achieved in the near infrared region. This study clearly attributes to the fact that the zero dispersion wavelength at the near infrared region, very high birefringence and low confinement loss can be adjusted according to the necessity by changing the structural parameters with considerable fabrication tolerance. This fiber can prove itself useful in laser technology, telecommunication, non-linear application, sensor technology and also in making polarization maintaining devices. © 2017 Elsevier B.V.

2017

A robust optical fiber sensor for the detection of petrol adulteration

Authors
Pathak, AK; Gangwar, RK; Priyadarshini, P; Singh, VK;

Publication
Optik

Abstract
An intrinsic intensity modulated no core fiber sensor (NCFS) is presented in this paper for rapid detection of adulteration in petrol with kerosene. The sensing principle is based on the phenomenon of absorption of evanescent waves. The sensing head of NCFS is fabricated by stubbing a small section of no core fiber (NCF) between two multi-mode fibers (MMF). A high sensitivity 390 nW/% and 110 nW/% are obtained by the proposed sensor for low and high level of adulteration. The intensity variation and confinement loss with different concentrations of the kerosene in petrol are then verified theoretically by using finite element method. It is found that the theoretical results agree very well with experimental results. The proposed sensor exhibits fast response time and good repeatability in addition to its high sensitivity. The sensor can be useful in industries and automotive companies due to its small size, easy to fabricate, safe with inflammable fuels and required small amount for detection. © 2017 Elsevier GmbH

2017

Effect of ethanol infiltration on the zero dispersion wavelength of solid core photonic crystal fiber

Authors
Gangwar, RK; Pathak, AK; Priyadarshani, P; Singh, VK;

Publication
Optik

Abstract
In this paper, a hexagonal structure of ethanol filled solid core photonic crystal fiber having dispersion shifted properties is presented. The guiding properties, like effective mode area and dispersion, of the ethanol filled photonic crystal fiber are studied by using the full vectorial finite element method. The numerical simulation results show that the selectively filling of the ethanol in the cladding holes of photonic crystal fiber shifts the zero dispersion wavelength from near infrared region (0.98 µm) to mid infrared region (1.55 µm). This kind of photonic crystal fiber structure is very useful for dispersion compensating tool, sensing applications, fiber laser devices and non-linear applications like supercontinuum generation. © 2017 Elsevier GmbH