Ultralow Dispersion Multicomponent Thin‐Film Chalcogenide Glass for Broadband Gradient‐Index Optics
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 13, 2018
- Source ID
- 10.1002/adma.201803628
Entities
People
- Alexej Pogrebnyakov
- Andrew Kirk
- Andrew M. Swisher
- Carlo G. Pantano
- Charmayne Lonergan
- Clara Rivero‐Baleine
- Fedor Kompan
- Ivan Divliansky
- Justin Cook
- Kathleen Richardson
- Laura Sisken
- Leonid B. Glebov
- Liu Liu
- Martin C. Richardson
- Myungkoo Kang
- Stephen Aiken
- Teodor Malendevych
- Theresa S. Mayer
Organizations
- Defense Advanced Research Projects Agency
- Lockheed Martin
- Pennsylvania State University
- University of Central Florida