Griffith, Matthew J. and Willis, Matthew S. and Kumar, Pankaj and Holdsworth, John L. and Bezuidenhout, Henco and Zhou, Xiaojing and Belcher, Warwick and Dastoor, Paul C. (2016) Activation of Organic Photovoltaic Light Detectors Using Bend Leakage from Optical Fibers. ACS Applied Materials and Interfaces, 8 (12). 7928-7937. ISSN 1944-8244

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This work investigates the detection and subsequent utilization of leaked light from bends in a silica optical fiber using organic photovoltaic detectors. The optic power lost by single mode and multimode silica optical fibers was calibrated for bend radii between 1 and 7 mm for 532 and 633 nm light, exhibiting excellent agreement with previous theoretical solutions. The spatial location of maximum power leakage on the exterior of the fiber was found to exist in the same plane as the fiber, with a 10 degrees offset from the normal. Two different organic photovoltaic detectors fabricated using a poly(3-hexylthiophene):indene-C-60-bisadduct donor acceptor blend cast from chloroform and chlorobenzene were fabricated to detect the leaked light. The two detectors exhibited different photovoltaic performances, predominantly due to different active layer thicknesses. Both devices showed sensitivity to leakage light, exhibiting voltages between 200 and 300 mV in response to leaked light from the fiber. The temporal responses of the devices were observed to differ, with a rise time from 10% to 90% of maximum voltage of 1430 mu s for the chlorobenzene device, and a corresponding rise time of 490 mu s for the higher performing chloroform device. The two OPVs were used to simultaneously detect leaked light from induced bends in the optical fiber, with the differing temporal profiles employed to create a unique time correlated detection signal with enhanced security. The delay between detection of each OPV voltage could be systematically varied, allowing for either a programmable and secure single detection signal or triggering of multiple events with variable time resolution. The results reported in this study present exciting avenues toward the deployment of this simple and noninvasive optical detection system in a range of different applications.

Item Type: Article
Additional Information: Copyright for this article belongs to M/S American Chemical Society.
Uncontrolled Keywords: bend leakage, optical fiber, organic photovoltaic cell, photodetector, polymer
Subjects: Materials Science
Nanoscience/ Nanotechnology
Depositing User: Dr. Rajpal Walke
Date Deposited: 02 Jun 2017 07:54
Last Modified: 02 Jun 2017 07:54

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