Center for Photonics Technology
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The Center for Photonics Technology at Virginia Tech is focused on innovation in fiber optics, fiber optic sensors, and biomedical and applied optics. With five faculty and over 30 students and research staff, CPT is a world leader in fiber optic sensor research.
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Scholarly Works, Center for Photonics Technology [26]
Research articles, presentations, and other scholarship
Recent Submissions
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Powder-in-Tube Reactive Molten-Core Fabrication of Glass-Clad BaO-TiO2-SiO2 Glass–Ceramic Fibers
(MDPI, 2020-01-15)In this paper we report the fabrication of glass-clad BaO-TiO2-SiO2 (BTS) glass–ceramic fibers by powder-in-tube reactive molten-core drawing and successive isothermal heat treatment. Upon ... -
Dissolution and Diffusion-Based Reactions within YBa2Cu3O7-x Glass Fibers
(MDPI, 2019-12-20)This work presents a thorough identification and analysis of the dissolution and diffusion-based reaction processes that occur during the drawing of YBa2Cu3O7-x (YBCO) glass-clad fibers, ... -
Coupled Mode Analysis for 3D Stress-Free Elastic Acoustic Waveguide
(IEEE, 2019)Acoustic sensors and acoustic measurements receive much attention in various applications. Because waveguides are commonly used in sensor design, theoretical means to study acoustic propagation and interaction in waveguides ... -
Photonic Biosensor Assays to Detect and Distinguish Subspecies of Francisella tularensis
(MDPI, 2011-03-07)The application of photonic biosensor assays to diagnose the category-A select agent Francisella tularensis was investigated. Both interferometric and long period fiber grating sensing structures were successfully demonstrated; ... -
Long Period Gratings in Random Hole Optical Fibers for Refractive Index Sensing
(Mdpi Ag, 2011-02-01)We have demonstrated the fabrication of long period gratings in random hole optical fibers. The long period gratings are fabricated by a point-by-point technique using a CO2 laser. The gratings with a periodicity of 450 ... -
Quantitative phase spectroscopy
(2012-05-01)Quantitative phase spectroscopy is presented as a novel method of measuring the wavelength-dependent refractive index of microscopic volumes. Light from a broadband source is filtered to an ~5 nm bandwidth and rapidly tuned ... -
ZrO2 Thin-Film-Based Sapphire Fiber Temperature Sensor
(Optical Society of America, 2012-10-01)A submicrometer-thick zirconium dioxide film was deposited on the tip of a polished C-plane sapphire fiber to fabricate a temperature sensor that can work to an extended temperature range. Zirconium dioxide was selected ... -
Surface-Mount Sapphire Interferometric Temperature Sensor
(Optical Society of America, 2006-02-01)A fiber-optic high-temperature sensor is demonstrated by bonding a 45 degrees-polished single-crystal sapphire fiber on the surface of a sapphire wafer, whose optical thickness is temperature dependent and measured by ... -
Signal Processing Of White-Light Interferometric Low-Finesse Fiber-Optic Fabry-Perot Sensors
(Optical Society of America, 2013-08-01)Signal processing for low-finesse fiber-optic Fabry-Perot sensors based on white-light interferometry is investigated. The problem is demonstrated as analogous to the parameter estimation of a noisy, real, discrete harmonic ... -
Self-Compensating Fiber Optic Flow Sensor System And Its Field Applications
(Optical Society of America, 2004-07-01)A self-compensating fiber optic flow sensor system based on the principle of broadband white-light interferometers and cantilever beam bending is described. The fiber optic sensor system uses two fiber ferrule sensors that ... -
Optical Scanning Cryptography For Secure Wireless Transmission
(Optical Society of America, 2003-09-01)We propose a method for secure wireless transmission of encrypted information. By use of an encryption key, an image or document is optically encrypted by optical heterodyne scanning and hence encryption is performed on ... -
Optical Image Recognition Of Three-Dimensional Objects
(Optical Society of America, 1999-09-01)A three-dimensional (3-D) optical image-recognition technique is proposed and studied. The proposed technique is based on two-pupil optical heterodyne scanning and is capable of performing 3-D image recognition. A hologram ... -
Observation Of The Enhanced Backscattering Of Light By The End Of A Tilted Dielectric Cylinder Owing To The Caustic Merging Transition
(Optical Society of America, 2003-03-01)The scattering of light by obliquely illuminated circular dielectric cylinders was previously demonstrated to be enhanced by a merger of Airy caustics at a critical tilt angle. [Appl. Opt. 37, 1534 (1998)]. A related ... -
Multimode Excitation-Induced Phase Shifts in Intrinsic Fabry-Perot Interferometric Fiber Sensor Spectra
(Optical Society of America, 2010-11-01)We report the modal analysis of optical fiber single-mode-multimode-single-mode intrinsic Fabry-Perot interferometer sensors. The multimode nature of the Fabry-Perot cavity gives rise to an additional phase term in the ... -
Manufacturing Of A Fiber Optic Young's Double Pinhole Interferometer For Use As A 3D Profilometer
(Optical Society of America, 2000-05-01)The method used to manufature a Young's double pinhole interferometer is discussed. This interferometer is destined to be used in a surface profilometer using two wavelengths so that the zero order fringe can be determined. ... -
Method Of Multiple References For 3D Imaging with Fourier Transform Interferometry
(Optical Society of America, 2010-03-01)This letter presents an improved phase referencing technique, called Method of Multiple References, for optical profilometry. Based on a lookup table, the method eliminates several major drawbacks of single-reference Fourier ... -
Micro-Air-Gap Based Intrinsic Fabry-Perot Interferometric Fiber-Optic Sensor
(Optical Society of America, 2006-05-01)A simple intrinsic Fabry-Perot interferometric (IFPI) sensor is developed. The sensor is fabricated by two micro air gaps as reflective mirrors in a fiber to form a Fabry-Perot cavity. Theoretical and experimental studies ... -
Implementation Of A Loss-Compensated Recirculating Delayed Self-Heterodyne Interferometer For Ultranarrow Laser Linewidth Measurement
(Optical Society of America, 2006-12-01)Ultranarrow laser linewidth measurement using an optimized loss-compensated recirculating delayed self-heterodyne interferometer is described. An experimental setup is constructed to measure subkilohertz laser linewidths. ... -
In-Fiber Reflection Mode Interferometer Based on A Long-Period Grating For External Refractive-Index Measurement
(Optical Society of America, 2005-04-01)We present two novel schemes for refractometry based on a long-period fiber grating- (LPG-) based Michelson interferometer. These schemes are designed to overcome the measurement dependence of previously demonstrated ... -
Frequency-Estimation-Based Signal-Processing Algorithm For White-Light Optical Fiber Fabry-Perot Interferometers
(Optical Society of America, 2005)A novel signal-processing algorithm based on frequency estimation of the spectrogram of single-mode optical fiber Fabry-Perot interferometric sensors under white-light illumination is described. The frequency-estimation ...
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