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.
Recommended Citation
M. Kang and A. M. Swisher and A. V. Pogrebnyakov and L. Liu and A. Kirk and S. Aiken and L. Sisken and C. Lonergan and J. Cook and T. Malendevych and F. Kompan and I. Divliansky and L. B. Glebov and M. C. Richardson and C. Rivero-Baleine and C. G. Pantano, "Ultralow Dispersion Multicomponent Thin-Film Chalcogenide Glass For Broadband Gradient-Index Optics," Advanced Materials, vol. 30, no. 39, article no. 1803628, Wiley, Sep 2018.
The definitive version is available at https://doi.org/10.1002/adma.201803628
Department(s)
Materials Science and Engineering
Publication Status
Full Access
Keywords and Phrases
achromatic microlenses; chalcogenide glass; gradient refractive index; optical nanocomposites; photothermal process
International Standard Serial Number (ISSN)
1521-4095; 0935-9648
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2023 Wiley, All rights reserved.
Publication Date
26 Sep 2018
PubMed ID
30101495
Comments
U.S. Department of Defense, Grant FA8650-12-C-7225