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Title: Controlling the Infrared Dielectric Function through Atomic-Scale Heterostructures

Abstract

Surface phonon polaritons (SPhPs), the surface-bound electromagnetic modes of a polar material resulting from the coupling of light with optic phonons, offer immense technological opportunities for nanophotonics in the infrared (IR) spectral region. However, once a particular material is chosen, the SPhP characteristics are fixed by the spectral positions of the optic phonon frequencies. Here, we provide a demonstration of how the frequency of these optic phonons can be altered by employing atomic-scale superlattices (SLs) of polar semiconductors using AlN/GaN SLs as an example. Using second harmonic generation (SHG) spectroscopy, we show that the optic phonon frequencies of the SLs exhibit a strong dependence on the layer thicknesses of the constituent materials. Furthermore, new vibrational modes emerge that are confined to the layers, while others are centered at the AlN/GaN interfaces. As the IR dielectric function is governed by the optic phonon behavior in polar materials, controlling the optic phonons provides a means to induce and potentially design a dielectric function distinct from the constituent materials and from the effective-medium approximation of the SL. We show that atomic-scale AlN/GaN SLs instead have multiple Reststrahlen bands featuring spectral regions that exhibit either normal or extreme hyperbolic dispersion with both positive andmore » negative permittivities dispersing rapidly with frequency. Apart from the ability to engineer the SPhP properties, SL structures may also lead to multifunctional devices that combine the mechanical, electrical, thermal, or optoelectronic functionality of the constituent layers. We propose that this effort is another step toward realizing user-defined, actively tunable IR optics and sources.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [1];  [3];  [2];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [4]; ORCiD logo [4];  [1];  [1];  [5];  [6];  [1] more »;  [2];  [2];  [7] « less
+ Show Author Affiliations
  1. Naval Research Lab. (NRL), Washington, DC (United States)
  2. Fritz Haber Inst., Berlin (Germany)
  3. Howard Univ., Washington, D.C. (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Naval Research Laboratory, Washington D.C.
  6. McMaster Univ., Hamilton, ON (United States)
  7. Vanderbilt Univ., Nashville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1559667
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
ACS Nano
Additional Journal Information:
Journal Volume: 13; Journal Issue: 6
Publisher:
ACS Publications
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Ratchford, Daniel, Winta, Christopher, Chatzakis, Ioannis, Ellis, Chase, Passler, Nikolai, Winterstein, Jonathan, Dev, Pratibha, Razdolski, Ilya, Tischler, Joseph, Vurgaftman, Igor, Katz, Michael, Nepal, Neeraj, Hardy, Matthew, Hachtel, Jordan, Idrobo Tapia, Juan Carlos, Reinecke, Thomas, Giles, Alexander, Katzer, D, Bassim, Nabil, Stroud, Rhonda, Wolf, Martin, Paarmann, Alex, and Caldwell, Joshua. Controlling the Infrared Dielectric Function through Atomic-Scale Heterostructures. United States: N. p., 2019. Web. doi:10.1021/acsnano.9b01275.
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Ratchford, Daniel, Winta, Christopher, Chatzakis, Ioannis, Ellis, Chase, Passler, Nikolai, Winterstein, Jonathan, Dev, Pratibha, Razdolski, Ilya, Tischler, Joseph, Vurgaftman, Igor, Katz, Michael, Nepal, Neeraj, Hardy, Matthew, Hachtel, Jordan, Idrobo Tapia, Juan Carlos, Reinecke, Thomas, Giles, Alexander, Katzer, D, Bassim, Nabil, Stroud, Rhonda, Wolf, Martin, Paarmann, Alex, & Caldwell, Joshua. Controlling the Infrared Dielectric Function through Atomic-Scale Heterostructures. United States. https://doi.org/10.1021/acsnano.9b01275
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Ratchford, Daniel, Winta, Christopher, Chatzakis, Ioannis, Ellis, Chase, Passler, Nikolai, Winterstein, Jonathan, Dev, Pratibha, Razdolski, Ilya, Tischler, Joseph, Vurgaftman, Igor, Katz, Michael, Nepal, Neeraj, Hardy, Matthew, Hachtel, Jordan, Idrobo Tapia, Juan Carlos, Reinecke, Thomas, Giles, Alexander, Katzer, D, Bassim, Nabil, Stroud, Rhonda, Wolf, Martin, Paarmann, Alex, and Caldwell, Joshua. Tue . "Controlling the Infrared Dielectric Function through Atomic-Scale Heterostructures". United States. https://doi.org/10.1021/acsnano.9b01275. https://www.osti.gov/servlets/purl/1559667.
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@article{osti_1559667,
title = {Controlling the Infrared Dielectric Function through Atomic-Scale Heterostructures},
author = {Ratchford, Daniel and Winta, Christopher and Chatzakis, Ioannis and Ellis, Chase and Passler, Nikolai and Winterstein, Jonathan and Dev, Pratibha and Razdolski, Ilya and Tischler, Joseph and Vurgaftman, Igor and Katz, Michael and Nepal, Neeraj and Hardy, Matthew and Hachtel, Jordan and Idrobo Tapia, Juan Carlos and Reinecke, Thomas and Giles, Alexander and Katzer, D and Bassim, Nabil and Stroud, Rhonda and Wolf, Martin and Paarmann, Alex and Caldwell, Joshua},
abstractNote = {Surface phonon polaritons (SPhPs), the surface-bound electromagnetic modes of a polar material resulting from the coupling of light with optic phonons, offer immense technological opportunities for nanophotonics in the infrared (IR) spectral region. However, once a particular material is chosen, the SPhP characteristics are fixed by the spectral positions of the optic phonon frequencies. Here, we provide a demonstration of how the frequency of these optic phonons can be altered by employing atomic-scale superlattices (SLs) of polar semiconductors using AlN/GaN SLs as an example. Using second harmonic generation (SHG) spectroscopy, we show that the optic phonon frequencies of the SLs exhibit a strong dependence on the layer thicknesses of the constituent materials. Furthermore, new vibrational modes emerge that are confined to the layers, while others are centered at the AlN/GaN interfaces. As the IR dielectric function is governed by the optic phonon behavior in polar materials, controlling the optic phonons provides a means to induce and potentially design a dielectric function distinct from the constituent materials and from the effective-medium approximation of the SL. We show that atomic-scale AlN/GaN SLs instead have multiple Reststrahlen bands featuring spectral regions that exhibit either normal or extreme hyperbolic dispersion with both positive and negative permittivities dispersing rapidly with frequency. Apart from the ability to engineer the SPhP properties, SL structures may also lead to multifunctional devices that combine the mechanical, electrical, thermal, or optoelectronic functionality of the constituent layers. We propose that this effort is another step toward realizing user-defined, actively tunable IR optics and sources.},
doi = {10.1021/acsnano.9b01275},
journal = {ACS Nano},
number = 6,
volume = 13,
place = {United States},
year = {Tue Jun 04 00:00:00 EDT 2019},
month = {Tue Jun 04 00:00:00 EDT 2019}
}
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    • DOI: 10.1103/physrevb.100.205419
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