Long-Lived Phonon Polaritons in Hyperbolic Materials

被引：61

作者：

Ni, Guangxin ^{[1
]}

McLeod, Alexander S. ^{[1
]}

Sun, Zhiyuan ^{[1
]}

Matson, Joseph R. ^{[2
]}

Lo, Chiu Fan Bowen ^{[1
]}

Rhodes, Daniel A. ^{[3
]}

Ruta, Francesco L. ^{[1
,4
]}

Moore, Samuel L. ^{[1
]}

Vitalone, Rocco A. ^{[1
]}

Cusco, Ramon ^{[5
]}

Artus, Luis ^{[5
]}

Xiong, Lin ^{[1
]}

Dean, Cory R. ^{[1
]}

Hone, James C. ^{[2
]}

Millis, Andrew J. ^{[1
]}

Fogler, Michael M. ^{[6
]}

Edgar, James H. ^{[7
]}

Caldwell, Joshua D. ^{[2
]}

Basov, D. N. ^{[1
]}

机构：

[1] Columbia Univ, Dept Phys, New York, NY 10027 USA

[2] Vanderbilt Univ, Dept Mech Engn, Nashville, TN 37235 USA

[3] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA

[4] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA

[5] CSIC, GEO3BCN, Lluis Sole i Sabaris S-N, Barcelona 08028, Spain

[6] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[7] Kansas State Univ, Tim Taylor Dept Chem Engn, Manhattan, KS 66506 USA

来源：

NANO LETTERS | 2021年 / 21卷 / 13期

基金：

美国国家科学基金会;

关键词：

phonon polaritons; hyperbolic materials; nanoinfrared imaging; van der Waals heterostructures; GRAPHENE; PLASMONS; CRYSTALS;

D O I：

10.1021/acs.nanolett.1c01562

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Natural hyperbolic materials with dielectric permittivities of opposite signs along different principal axes can confine long-wavelength electromagnetic waves down to the nanoscale, well below the diffraction limit. Confined electromagnetic waves coupled to phonons in hyperbolic dielectrics including hexagonal boron nitride (hBN) and alpha-MoO3 are referred to as hyperbolic phonon polaritons (HPPs). HPP dissipation at ambient conditions is substantial, and its fundamental limits remain unexplored. Here, we exploit cryogenic nanoinfrared imaging to investigate propagating HPPs in isotopically pure hBN and naturally abundant alpha-MoO3 crystals. Close to liquid-nitrogen temperatures, losses for HPPs in isotopic hBN drop significantly, resulting in propagation lengths in excess of 8 mu m, with lifetimes exceeding 5 ps, thereby surpassing prior reports on such highly confined polaritonic modes. Our nanoscale, temperature-dependent imaging reveals the relevance of acoustic phonons in HPP damping and will be instrumental in mitigating such losses for miniaturized mid-infrared technologies operating at liquid-nitrogen temperatures.

引用

页码：5767 / 5773

页数：7

共 32 条

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