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Directed light emission from monolayers on 2D materials via optical interferences.

P Trofimov¹, S Juergensen¹, A Dewambrechies Fernández¹

¹Physics Department, Freie Universität Berlin, Berlin, Germany.

The Journal of Chemical Physics

|August 22, 2025

Summary

Substrate thickness controls the direction of light reflection and emission from 2D materials. Optical interference in substrates like hexagonal boron nitride (hBN) dictates these angle-dependent optical properties.

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Area of Science:

Materials Science
Optoelectronics
Nanotechnology

Background:

Two-dimensional (2D) materials exhibit unique electronic and optical properties.
The optical response of 2D material monolayers is influenced by their substrate.
Tuning 2D material properties through substrate selection is crucial for device applications.

Purpose of the Study:

To investigate how substrate thickness affects the angle-dependent optical response of 2D material monolayers.
To understand the role of optical interference in substrate-mediated optical properties.
To explore potential applications in controlling light emission direction.

Main Methods:

Angle-resolved reflectivity and photoluminescence spectroscopy were used.
Studies were performed on molecular monolayers on hexagonal boron nitride (hBN) flakes of varying thicknesses.
Transfer matrix simulations were employed to model optical interference.

Main Results:

Light reflection and emission from monolayers showed strongly directed behavior.
The directionality of optical response was dependent on the hBN substrate thickness.
Simulations confirmed optical interference within the hBN as the cause of angle-dependent properties.

Conclusions:

Optical interference in substrates significantly impacts the angle-dependent optical properties of 2D materials.
Substrate thickness is a critical parameter for controlling light emission direction.
Findings have implications for optoelectronic devices and lighting technology.