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Invited Talks: Dr. Victor I. Kopp

Dr. Victor I. Kopp

R&D Director
Chiral Photonics, Inc., Clifton, New Jersey 07012

[Victor Kopp]

Victor Kopp is Director of Research and Development of Chiral Photonics, Inc. He received an MS in physics from St. Petersburg University and a Ph.D. in laser physics from the Vavilov Optical Institute, Russia in 1992. He worked there as a Senior Researcher investigating lasing and the interaction of electron and Raman resonances in Raman-active crystals, and photo-induced second harmonic generation in glasses. Dr. Kopp was a Research Associate at Queens College of City University of New York from 1997 to 2000, where he studied wave propagation in chiral waveguides and together with Azriel Genack, developed the scientific basis for Chiral Photonics, Inc. and co-founded the Company. Working at Chiral Photonics, he discovered three types of chiral gratings in optical fibers and these results were published in the journal Science. Dr. Kopp was awarded the Hewlett-Packard Opto Best Paper Award of the SPIE 1999 Photonics West Conference and was invited to present more recent finding at the IEEE LEOS 2004 and 2006 Meetings. He was also a program committee member and a session chairman of SPIE's conference entitled “Photonic Crystals and Photonic Crystal Fibers for Sensing Applications” as part of Optics East in October 2005. His research interests, presented in numerous publications, include wave propagation through periodic media, nonlinear optics and photonic devices. He has 16 US patents on photonic band gap devices, sensors, lasers and fiber gratings.

 

Chiral Fiber Gratings: Perspectives and Challenges for Sensing Applications

Victor I. Kopp, Victor M. Churikov, Guoyin Zhang, Jonathan Singer, Chris Draper, Daniel Neugroschl and Azriel Z. Genack

Chiral Photonics, Inc., Clifton, New Jersey 07012

Chiral fiber gratings are produced in a micro forming process by twisting an optical fiber with a noncircular or non-concentric core as they pass though a miniature oven. Periodic glass structures as stable as the glass material itself are produced with helical pitch from a few to a few hundred microns. The geometry of the fiber cross section determines the symmetry of the resulting structure and its polarization selectivity. Single helix structures are polarization insensitive while double helix gratings interact only with a single optical polarization, allowing the orthogonal polarization to be used for sensor multiplexing or as a reference channel. Both single and double helix gratings may act as a fiber long period grating, coupling the core and cladding modes. The coupling is manifested in a series of narrow dips in the transmission spectrum. The dip position is sensitive to fiber elongation, twist and temperature, and to the refractive index of the surrounding medium. The suitability of chiral gratings for sensing pressure, temperature and liquid levels is investigated. Polarization insensitive silica glass gratings demonstrated excellent stability up to temperatures of 600°C, while a pressure sensor based on polarization selective chiral gratings exhibited a dynamic range of more than 40 dB. Gasoline level sensors which do not utilize electrical circuits which can produce sparks were also demonstrated using chiral gratings.

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