Universität zu Köln

Li, Weiwu, Riegel, Konstantin, Liu, Chuanpu, Taskin, Alexey, Ando, Yoichi ORCID: 0000-0002-3553-3355, Liao, Zhimin, Dressel, Martin ORCID: 0000-0003-1907-052X and Yan, Yuan (2020). Acoustic plasmonics of Au grating/Bi2Se3 thin film/sapphire hybrid structures. Chin. Phys. B, 29 (6). BRISTOL: IOP PUBLISHING LTD. ISSN 1741-4199

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Abstract

The surface plasmon polaritons of the topological insulator Bi2Se3 can be excited by using etched grating or grave structures to compensate the wave vector mismatch of the incident photon and plasmon. Here, we demonstrate novel gold grating/Bi2Se3 thin film/sapphire hybrid structures, which allow the excitation of surface plasmon polaritons propagating through nondestructive Bi2Se3 thin film with the help of gold diffractive gratings. Utilizing periodic Au surface structures, the momentum can be matched and the normal-incidence infrared reflectance spectra exhibit pronounced dips. When the width of the gold grating W (with a periodicity 2W) increases from 400 nm to 1500 nm, the resonant frequencies are tuned from about 7000 cm(-1) to 2500 cm(-1). In contrast to the expected root q dispersion for both massive and massless fermions, where q similar to pi/W is the wave vector, we observe a sound-like linear dispersion even at room temperature. This surface plasmon polaritons with linear dispersion are attributed to the unique noninvasive fabrication method and high mobility of topological surface electrons. This novel structure provides a promising application of Dirac plasmonics.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Li, Weiwu UNSPECIFIED UNSPECIFIED UNSPECIFIED Riegel, Konstantin UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Chuanpu UNSPECIFIED UNSPECIFIED UNSPECIFIED Taskin, Alexey UNSPECIFIED UNSPECIFIED UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED Liao, Zhimin UNSPECIFIED UNSPECIFIED UNSPECIFIED Dressel, Martin UNSPECIFIED orcid.org/0000-0003-1907-052X UNSPECIFIED Yan, Yuan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-331780
DOI:	10.1088/1674-1056/ab8a3c
Journal or Publication Title:	Chin. Phys. B
Volume:	29
Number:	6
Date:	2020
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1741-4199
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TOPOLOGICAL INSULATOR; DIRAC PLASMONS; BI2SE3; MODES; FILMS Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/33178