Temperature assisted band-gap engineering in all-solid chalcogenide holey fiber for mid-IR application

Ajanta Barh; R. K. Varshney; B. P. Pal; J. Sanghera; L. B. Shaw

doi:10.1117/12.2182330

15 June 2015 Temperature assisted band-gap engineering in all-solid chalcogenide holey fiber for mid-IR application

Ajanta Barh, R. K. Varshney, B. P. Pal, J. Sanghera, L. B. Shaw

Proceedings Volume 9654, International Conference on Optics and Photonics 2015; 96541P (2015) https://doi.org/10.1117/12.2182330
Event: International Conference on Optics and Photonics 2015, 2015, Kolkata, India

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.

Citation Download Citation

Ajanta Barh, R. K. Varshney, B. P. Pal, J. Sanghera, and L. B. Shaw "Temperature assisted band-gap engineering in all-solid chalcogenide holey fiber for mid-IR application", Proc. SPIE 9654, International Conference on Optics and Photonics 2015, 96541P (15 June 2015); https://doi.org/10.1117/12.2182330

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