Cathodoluminescence of Ultrathin Twisted Ge1–xSnxS van der Waals Nanoribbon Waveguides

Sutter, Peter; Khorashad, Larousse Khosravi; Argyropoulos, Christos; Sutter, Eli

doi:10.1002/adma.202006649

Title: Cathodoluminescence of Ultrathin Twisted Ge_1–xSn_xS van der Waals Nanoribbon Waveguides

Journal Article · Sun Dec 06 00:00:00 EST 2020 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202006649· OSTI ID:1780782

^[1]; Khorashad, Larousse Khosravi ^[1]; Argyropoulos, Christos ^[1]; Sutter, Eli ^[1]

Univ. of Nebraska, Lincoln, NE (United States)

Abstract Ultrathin van der Waals semiconductors have shown extraordinary optoelectronic and photonic properties. Propagating photonic modes make layered crystal waveguides attractive for photonic circuitry and for studying hybrid light–matter states. Accessing guided modes by conventional optics is challenging due to the limited spatial resolution and poor out‐of‐plane far‐field coupling. Scanning near‐field optical microscopy can overcome these issues and can characterize waveguide modes down to a resolution of tens of nanometers, albeit for planar samples or nanostructures with moderate height variations. Electron microscopy provides atomic‐scale localization also for more complex geometries, and recent advances have extended the accessible excitations from interband transitions to phonons. Here, bottom‐up synthesized layered semiconductor (Ge _1– _x Sn _x S) nanoribbons with an axial twist and deep subwavelength thickness are demonstrated as a platform for realizing waveguide modes, and cathodoluminescence spectroscopy is introduced as a tool to characterize them. Combined experiments and simulations show the excitation of guided modes by the electron beam and their efficient detection via photons emitted in the ribbon plane, which enables the measurement of key properties such as the evanescent field into the vacuum cladding with nanometer resolution. The results identify van der Waals waveguides operating in the infrared and highlight an electron‐microscopy‐based approach for probing complex‐shaped nanophotonic structures.

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Research Organization:: Univ. of Nebraska, Lincoln, NE (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); US Department of the Navy, Office of Naval Research (ONR)

Grant/Contract Number:: SC0016343; N00014-19-1-2384

OSTI ID:: 1780782

Alternate ID(s):: OSTI ID: 1804198

Journal Information:: Advanced Materials, Vol. 33, Issue 3; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Cathodoluminescence of Ultrathin Twisted Ge_1–xSn_xS van der Waals Nanoribbon Waveguides