Enabling Waveguide Optics in Rhombohedral-Stacked Transition Metal Dichalcogenides with Laser-Patterned Grating Couplers

Mooshammer F, Xu X, Trovatello C, Peng ZH, Yang B, Amontree J, Zhang S, Hone J, Dean CR, Schuck PJ, Basov DN (2024)

Publication Type: Journal article

Publication year: 2024

Journal

ACS nano American Chemical Society

Book Volume: 18

Pages Range: 4118-4130

Journal Issue: 5

DOI: 10.1021/acsnano.3c08522

Abstract

Waveguides play a key role in the implementation of on-chip optical elements and, therefore, lie at the heart of integrated photonics. To add the functionalities of layered materials to existing technologies, dedicated fabrication protocols are required. Here, we build on laser writing to pattern grating structures into bulk noncentrosymmetric transition metal dichalcogenides with grooves as sharp as 250 nm. Using thin flakes of 3R-MoS2 that act as waveguides for near-infrared light, we demonstrate the functionality of the grating couplers with two complementary experiments: first, nano-optical imaging is used to visualize transverse electric and magnetic modes, whose directional outcoupling is captured by finite element simulations. Second, waveguide second-harmonic generation is demonstrated by grating-coupling femtosecond pulses into the slabs in which the radiation partially undergoes frequency doubling throughout the propagation. Our work provides a straightforward strategy for laser patterning of van der Waals crystals, demonstrates the feasibility of compact frequency converters, and examines the tuning knobs that enable optimized coupling into layered waveguides.

Involved external institutions

Columbia University US United States (USA) (US)

How to cite

APA:

Mooshammer, F., Xu, X., Trovatello, C., Peng, Z.H., Yang, B., Amontree, J.,... Basov, D.N. (2024). Enabling Waveguide Optics in Rhombohedral-Stacked Transition Metal Dichalcogenides with Laser-Patterned Grating Couplers. ACS nano, 18(5), 4118-4130. https://dx.doi.org/10.1021/acsnano.3c08522

MLA:

Mooshammer, Fabian, et al. "Enabling Waveguide Optics in Rhombohedral-Stacked Transition Metal Dichalcogenides with Laser-Patterned Grating Couplers." ACS nano 18.5 (2024): 4118-4130.

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