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Title: Tunneling of two-dimensional surface polaritons through nanogaps in atomically thin crystals

Abstract

We theoretically investigate the tunneling of two-dimensional surface polaritons (2DSPs) through nanometer-wide gaps in atomically thin crystals. For quantitatively accurate results, we developed a rigorous model based on the diffraction of 2DSPs for strongly confined surface polaritons (i.e., the polariton wavelength much shorter than the free-pace photon wavelength). We find distinctive features of the tunneling of 2DSPs. First, radiation loss during the tunneling is shown to be negligible. Second, the reflection coefficient R and tunneling coefficient T are shown to exhibit an anomalous logarithm singularity in their dependency on the gap width. Even for a gap size over two orders of magnitude smaller than the surface polariton wavelength, an appreciable reflection coefficient was observed in our calculation. Finally, we show that when the gap size increases, the phase of R saturates very rapidly to a nontrivial value of π/4. Based on these results, we further examine resonant tunneling of 2DSP through two identical gaps separated by a distance L, and establish a resonance condition defined by L≈λsp(4n-1)/8 with a positive integer n.

Authors:
 [1];  [2];  [3]
  1. Seoul National Univ. (Korea, Republic of)
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Univ. of California, Berkeley, CA (United States). Kavli Energy NanoSciences Inst.; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Research Foundation of Korea (NRF)
OSTI Identifier:
1605238
Alternate Identifier(s):
OSTI ID: 1505003
Grant/Contract Number:  
AC02-05CH11231; NRF-2018R1C1B6009007
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 16; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Kang, Ji-Hun, Wang, Sheng, and Wang, Feng. Tunneling of two-dimensional surface polaritons through nanogaps in atomically thin crystals. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.165408.
Kang, Ji-Hun, Wang, Sheng, & Wang, Feng. Tunneling of two-dimensional surface polaritons through nanogaps in atomically thin crystals. United States. doi:10.1103/PhysRevB.99.165408.
Kang, Ji-Hun, Wang, Sheng, and Wang, Feng. Thu . "Tunneling of two-dimensional surface polaritons through nanogaps in atomically thin crystals". United States. doi:10.1103/PhysRevB.99.165408. https://www.osti.gov/servlets/purl/1605238.
@article{osti_1605238,
title = {Tunneling of two-dimensional surface polaritons through nanogaps in atomically thin crystals},
author = {Kang, Ji-Hun and Wang, Sheng and Wang, Feng},
abstractNote = {We theoretically investigate the tunneling of two-dimensional surface polaritons (2DSPs) through nanometer-wide gaps in atomically thin crystals. For quantitatively accurate results, we developed a rigorous model based on the diffraction of 2DSPs for strongly confined surface polaritons (i.e., the polariton wavelength much shorter than the free-pace photon wavelength). We find distinctive features of the tunneling of 2DSPs. First, radiation loss during the tunneling is shown to be negligible. Second, the reflection coefficient R and tunneling coefficient T are shown to exhibit an anomalous logarithm singularity in their dependency on the gap width. Even for a gap size over two orders of magnitude smaller than the surface polariton wavelength, an appreciable reflection coefficient was observed in our calculation. Finally, we show that when the gap size increases, the phase of R saturates very rapidly to a nontrivial value of π/4. Based on these results, we further examine resonant tunneling of 2DSP through two identical gaps separated by a distance L, and establish a resonance condition defined by L≈λsp(4n-1)/8 with a positive integer n.},
doi = {10.1103/PhysRevB.99.165408},
journal = {Physical Review B},
number = 16,
volume = 99,
place = {United States},
year = {2019},
month = {4}
}

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