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Proceedings Paper

Temperature assisted band-gap engineering in all-solid chalcogenide holey fiber for mid-IR application
Author(s): Ajanta Barh; R. K. Varshney; B. P. Pal; J. Sanghera; L. B. Shaw
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Paper Abstract

Presence of photonic band-gap (PBG) in an all-solid microstructured optical fiber (MOF), made of two fabrication compatible chalcogenide (Ch) glasses is theoretically investigated for potential application in the functional mid-infrared (IR) wavelength range. Cross-section of the MOF is formed by assuming periodically arranged wavelength scale circular air holes in a hexagonal pattern embedded in a uniform matrix. One type of Ch-glass is considered as the background material whereas another type of Ch-glass is assumed to fill the air holes. The relative index contrast between these two Ch-glasses is ~ 24%, for which PBG appears only for a suitable range of non-zero longitudinal wave vector. We have studied the scalability of this PBG by varying the lattice parameter of MOF and optimized the cross-section to attain the PBG at ~ 2 μm wavelength. Then by utilizing the thermo-optic properties of the glasses, the effect of external temperature (T) on the PBG is studied, and finally we have proposed a T-tunable wavelength filter/sensor at mid-IR wavelength with tuning sensitivity as high as ~ 140 pm/°C.

Paper Details

Date Published: 15 June 2015
PDF: 5 pages
Proc. SPIE 9654, International Conference on Optics and Photonics 2015, 96541P (15 June 2015); doi: 10.1117/12.2182330
Show Author Affiliations
Ajanta Barh, Indian Institute of Technology Delhi (India)
R. K. Varshney, Indian Institute of Technology Delhi (India)
B. P. Pal, Mahindra École Centrale (India)
J. Sanghera, U.S. Naval Research Lab. (United States)
L. B. Shaw, U.S. Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 9654:
International Conference on Optics and Photonics 2015
Kallol Bhattacharya, Editor(s)

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