Nano-optical imaging of van der Waals crystals: from ultrafast exciton dynamics to anisotropic waveguide modes

F. Mooshammer; X. Xu; C. Trovatello; Y. Shao; S. Zhang; P. J. Schuck; D. N. Basov

doi:10.1117/12.2675983

3 October 2023 Nano-optical imaging of van der Waals crystals: from ultrafast exciton dynamics to anisotropic waveguide modes

F. Mooshammer, X. Xu, C. Trovatello, Y. Shao, S. Zhang, P. J. Schuck, D. N. Basov

Author Affiliations +

Proceedings Volume 12654, Enhanced Spectroscopies and Nanoimaging 2023; 1265407 (2023) https://doi.org/10.1117/12.2675983
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

Near-field microscopy has emerged as a powerful tool for investigating the optoelectronic properties of van der Waals crystals on deeply subwavelength length scales. Complementary information may be obtained by interrogating the layered materials with electromagnetic radiation oscillating at vastly different frequencies: In the terahertz spectral range, for example, the polarizability of excitons in transition metal dichalcogenide (TMDC) heterostructures can be recorded on subcycle timescales–granting access to ultrafast formation dynamics or the exciton Mott transition with nanometer precision. In contrast, visible or near-infrared light propagates through thin van der Waals slabs in the form of waveguide modes (WMs). By resolving interference patterns in maps of the scattered electric field, the anisotropic dielectric tensor of layered materials is retrieved and signatures of strong light-matter coupling in the dispersion of the WMs are revealed. This approach also allows for boosting the potential of 3R-stacked TMDCs for applications in nonlinear optics by quantifying their birefringence, thus providing essential parameters for future phase-matched waveguide second harmonic generation and compact on-chip optical devices in general.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

F. Mooshammer, X. Xu, C. Trovatello, Y. Shao, S. Zhang, P. J. Schuck, and D. N. Basov "Nano-optical imaging of van der Waals crystals: from ultrafast exciton dynamics to anisotropic waveguide modes", Proc. SPIE 12654, Enhanced Spectroscopies and Nanoimaging 2023, 1265407 (3 October 2023); https://doi.org/10.1117/12.2675983

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available