Nanoscale Spectroscopy of Dielectric Properties of Mica

Alireza Fali; Sampath Gamage; Marquez Howard; Thomas G. Folland; Nadeemullah A. Mahadik; Tom Tiwald; Kirill Bolotin; Joshua D. Caldwell; Yohannes Abate

doi:10.1021/acsphotonics.0c00951

Journal article

Nanoscale Spectroscopy of Dielectric Properties of Mica

Alireza Fali, Sampath Gamage, Marquez Howard, Thomas G. Folland, Nadeemullah A. Mahadik, Tom Tiwald, Kirill Bolotin, Joshua D. Caldwell and Yohannes Abate

ACS photonics, Vol.8(1), pp.175-181

01/20/2021

DOI: 10.1021/acsphotonics.0c00951

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Abstract

Infrared dielectric properties of muscovite mica, one of the first van der Waals crystals, exfoliated on silicon and SiO2 substrates is studied using near-field nano-FTIR spectroscopy. The spectra of mica show strong thickness and wavelength dependence down to the monolayer-scale, with a prominent broad peak centered around similar to 1080 cm(-1) assigned to stretching vibrations of Si-O. We reveal that the infrared dielectric permittivity of mica is anisotropic, that is, has opposite signs along the inplane and out-of-plane axes, implying a Type I hyperbolic behavior in the range 920-1010 cm(-1) and a Type II hyperbolic behavior in the range 1050-1130 cm(-1). Experimentally measured nano-FTIR spectra agree well with analytical model calculations based on an extended finite dipole model for layered systems of the tip-sample interaction when the out-of-plane dielectric values (instead of the in-plane dielectric values) were used in the calculations.

Materials Science

Materials Science, Multidisciplinary

Nanoscience & Nanotechnology

Optics

Physical Sciences

Physics

Physics, Applied

Physics, Condensed Matter

Science & Technology

Science & Technology - Other Topics

Technology

Details

Title: Subtitle: Nanoscale Spectroscopy of Dielectric Properties of Mica
Creators: Alireza Fali - University of Georgia
Sampath Gamage - University of Georgia
Marquez Howard - University of Georgia
Thomas G. Folland - Vanderbilt University
Nadeemullah A. Mahadik - United States Naval Research Laboratory
Tom Tiwald - J.A. Woollam Company
Kirill Bolotin - Freie Universität Berlin
Joshua D. Caldwell - Vanderbilt University
Yohannes Abate - University of Georgia
Resource Type: Journal article
Publication Details: ACS photonics, Vol.8(1), pp.175-181
Publisher: Amer Chemical Soc
DOI: 10.1021/acsphotonics.0c00951
ISSN: 2330-4022
eISSN: 2330-4022
Number of pages: 7
Grant note: 639739 / ERC; European Research Council (ERC); European Commission FA9559-16-1-0172 / Air Force Office of Scientific Research; United States Department of Defense; Air Force Office of Scientific Research (AFOSR) DMR1904793; 1553251 / National Science Foundation; National Science Foundation (NSF) DMR 1508433 / NSF; National Science Foundation (NSF)
Language: English
Date published: 01/20/2021
Academic Unit: Physics and Astronomy
Record Identifier: 9984428808002771

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