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. 2023 Nov;35(44):e2302045.
doi: 10.1002/adma.202302045. Epub 2023 Sep 22.

Near- and Far-Field Observation of Phonon Polaritons in Wafer-Scale Multilayer Hexagonal Boron Nitride Prepared by Chemical Vapor Deposition

Eugenio Calandrini  1 , Kirill Voronin  2 , Osman Balci  3 , Maria Barra-Burillo  1 , Andrei Bylinkin  1   2 , Sachin M Shinde  3 , Subash Sharma  3 , Fèlix Casanova  1   4 , Luis E Hueso  1   4 , Andrei Chuvilin  1   4 , Clifford McAleese  5 , Ben R Conran  5 , Xiaochen Wang  5 , Kenneth Teo  5 , Valentyn S Volkov  6 , Andrea C Ferrari  3 , Alexey Y Nikitin  2   4 , Rainer Hillenbrand  1   4
Affiliations

Near- and Far-Field Observation of Phonon Polaritons in Wafer-Scale Multilayer Hexagonal Boron Nitride Prepared by Chemical Vapor Deposition

Eugenio Calandrini et al. Adv Mater. 2023 Nov.

Abstract

Polaritons in layered materials (LMs) are a promising platform to manipulate and control light at the nanometer scale. Thus, the observation of polaritons in wafer-scale LMs is critically important for the development of industrially relevant nanophotonics and optoelectronics applications. In this work, phonon polaritons (PhPs) in wafer-scale multilayer hexagonal boron nitride (hBN) grown by chemical vapor deposition are reported. By infrared nanoimaging, the PhPs are visualized, and PhP lifetimes of ≈0.6 ps are measured, comparable to that of micromechanically exfoliated multilayer hBN. Further, PhP nanoresonators are demonstrated. Their quality factors of ≈50 are about 0.7 times that of state-of-the-art devices based on exfoliated hBN. These results can enable PhP-based surface-enhanced infrared spectroscopy (e.g., for gas sensing) and infrared photodetector applications.

Keywords: chemical vapor deposition; hexagonal boron nitride; phonon polaritons; wafer-scale.

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