Spatial optical filter sensor based on hollow-core silica tube

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Marta S Ferreira (Author) Other; Kay Schuster (Author) Other; Jens Kobelke (Author) Other; Jose L Santos (Author) FCUP; Orlando Frazao (Author) FCUP

Journal

Title: Optics Letters

Vol. 37

Pages: 890-892

ISSN: 0146-9592

Publisher: Optical Society of America

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 10 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-002-CK6

DOI: 10.1364/ol.37.000890

Abstract (EN): A spatial optical filter based on a hollow-core silica tube is proposed. Because of the hollow-core dimensions, it is possible to obtain a periodical spatial filter ranging from 1200 to 1700 nm with a channel spacing of 2.64 THz. The bandwidth is approximately 5.32 nm, and the isolation loss is similar to 30 dB. The optical losses are approximately similar to 0.67 dB/mm for a wavelength of 1500 nm. The 40 mm long spatial optical filter is tested as a sensing element and subjected to different physical parameters. The spatial optical filter is wavelength sensitive to strain and temperature, while for refractive-index variations there is an optical power dependency. This fiber structure can be used as a sensing element for extreme conditions, such as in very high temperature environments, where it presents a sensitivity of 27.5 pm degrees C-1. (C) 2012 Optical Society of America

Language: English

Type (Professor's evaluation): Scientific