Mid- to Far-Infrared Anisotropic Dielectric Function of HfS2 and HfSe2
| Author(s) | Kowalski, Ryan A. | |
| Author(s) | Nolen, Joshua Ryan | |
| Author(s) | Varnavides, Georgios | |
| Author(s) | Silva, Sebastian Mika | |
| Author(s) | Allen, Jack E. | |
| Author(s) | Ciccarino, Christopher J. | |
| Author(s) | Juraschek, Dominik M. | |
| Author(s) | Law, Stephanie | |
| Author(s) | Narang, Prineha | |
| Author(s) | Caldwell, Joshua D. | |
| Date Accessioned | 2022-09-29T17:12:14Z | |
| Date Available | 2022-09-29T17:12:14Z | |
| Publication Date | 2022-09-06 | |
| Description | This is the peer reviewed version of the following article: Kowalski, R. A., Nolen, J. R., Varnavides, G., Silva, S. M., Allen, J. E., Ciccarino, C. J., Juraschek, D. M., Law, S., Narang, P., Caldwell, J. D., Mid- to Far-Infrared Anisotropic Dielectric Function of HfS2 and HfSe2. Adv. Optical Mater. 2022, 2200933. https://doi.org/10.1002/adom.202200933, which has been published in final form at https://doi.org/10.1002/adom.202200933. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. This article will be embargoed until 09/06/2023. | en_US |
| Abstract | The far-infrared (far-IR) remains a relatively underexplored region of the electromagnetic spectrum extending roughly from 20 to 100 µm in free-space wavelength. Research within this range has been restricted due to a lack of optical materials that can be optimized to reduce losses and increase sensitivity, as well as by the long free-space wavelengths associated with this spectral region. Here the exceptionally broad Reststrahlen bands of two Hf-based transition metal dichalcogenides (TMDs) that can support surface phonon polaritons (SPhPs) within the mid-infrared (mid-IR) into the terahertz (THz) are reported. In this vein, the IR transmission and reflectance spectra of hafnium disulfide (HfS2) and hafnium diselenide (HfSe2) flakes are measured and their corresponding dielectric functions are extracted. These exceptionally broad Reststrahlen bands (HfS2: 165 cm−1; HfSe2: 95 cm−1) dramatically exceed that of the more commonly explored molybdenum- (Mo) and tungsten- (W) based TMDs (≈5–10 cm−1), which results from the over sevenfold increase in the Born effective charge of the Hf-containing compounds. This work therefore identifies a class of materials for nanophotonic and sensing applications in the mid- to far-IR, such as deeply sub-diffractional hyperbolic and polaritonic optical antennas, as is predicted via electromagnetic simulations using the extracted dielectric function. | en_US |
| Sponsor | R.A.K. and J.R.N. contributed equally to this work. This work was supported by a Lunar Surface Technology Research Opportunities grant from NASA's Space Technology Research Grants Program (80NSSC 21K0766). J.R.N. acknowledges support from Office of Naval Research Grant N00014-18-12107. J.D.C. acknowledges support by the National Science Foundation under Grant No. 2128240. J.E.A. acknowledges support from the School for Science and Math at Vanderbilt. Work by G.V., D.M.J., and P.N. was partially supported by NSF DMR Grant No. 1905295. C.J.C. was supported by the Department of Energy “Photonics at Thermodynamic Limits Energy Frontier Research Center” under Grant No. DE-SC0019140. D.M.J. was also supported by the Swiss National Science Foundation (SNSF) under Project ID 184259 and the DARPA DRINQS Program under Award No. D18AC00014. P.N. is a Moore Inventor Fellow and gratefully acknowledges support from the Gordon and Betty Moore Foundation through Grant No. GBMF8048. Calculations were performed at the National Energy Research Scientific Computing Center (NERSC), supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. S.L. acknowledges funding from the National Science Foundation, Division of Materials Research under Award No. 1904760. S.M.S. acknowledges funding from the University of Delaware Summer Research Scholars program. | en_US |
| Citation | Kowalski, R. A., Nolen, J. R., Varnavides, G., Silva, S. M., Allen, J. E., Ciccarino, C. J., Juraschek, D. M., Law, S., Narang, P., Caldwell, J. D., Mid- to Far-Infrared Anisotropic Dielectric Function of HfS2 and HfSe2. Adv. Optical Mater. 2022, 2200933. https://doi.org/10.1002/adom.202200933 | en_US |
| ISSN | 2195-1071 | |
| URL | https://udspace.udel.edu/handle/19716/31421 | |
| Language | en_US | en_US |
| Publisher | Advanced Optical Materials | en_US |
| Keywords | dielectric function | en_US |
| Keywords | far-infrared | en_US |
| Keywords | nanophotonics | en_US |
| Keywords | polaritons | en_US |
| Keywords | transition-metal dichalcogenides | en_US |
| Title | Mid- to Far-Infrared Anisotropic Dielectric Function of HfS2 and HfSe2 | en_US |
| Type | Article | en_US |
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