Ultralow Dispersion Multicomponent Thin-Film Chalcogenide Glass For Broadband Gradient-Index Optics

Keywords

achromatic microlenses; chalcogenide glass; gradient refractive index; optical nanocomposites; photothermal process

Abstract

A novel photothermal process to spatially modulate the concentration of sub-wavelength, high-index nanocrystals in a multicomponent Ge-As-Pb-Se chalcogenide glass thin film resulting in an optically functional infrared grating is demonstrated. The process results in the formation of an optical nanocomposite possessing ultralow dispersion over unprecedented bandwidth. The spatially tailored index and dispersion modification enables creation of arbitrary refractive index gradients. Sub-bandgap laser exposure generates a Pb-rich amorphous phase transforming on heat treatment to high-index crystal phases. Spatially varying nanocrystal density is controlled by laser dose and is correlated to index change, yielding local index modification to ≈+0.1 in the mid-infrared.

Publication Date

9-26-2018

Publication Title

Advanced Materials

Volume

30

Issue

39

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1002/adma.201803628

Socpus ID

85052485833 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85052485833

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