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Updated: Nov 5, 2025

Exfoliation and Analysis of Large-area, Air-Sensitive Two-Dimensional Materials

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Published on: January 5, 2019

Tunable Optical Rotation in Twisted Black Phosphorus.

Su-Yun Wang¹, Kai-Xuan Huang¹, Qin-Qin Guo¹

¹The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, School of Physics and Teda Applied Physics Institute, Nankai University, Tianjin 300071, China.

The Journal of Physical Chemistry Letters

|May 13, 2021

Summary

Twisted black phosphorus (TBP) exhibits a significantly enhanced and tunable optical rotation effect, offering new possibilities for nanoscale polarization control in optoelectronics.

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Area of Science:

Materials Science
Optoelectronics
Nanotechnology

Background:

Black phosphorus (BP) is a 2D material with inherent anisotropy and birefringence.
These properties enable light field manipulation for optoelectronic and photonic applications.
Twist angle in twisted black phosphorus (TBP) offers a new dimension to tune optical anisotropy.

Purpose of the Study:

To investigate the large and tunable optical rotation effect in twisted black phosphorus (TBP).
To explore the impact of twist angle and BP thickness on optical anisotropy.
To develop an efficient method for preparing TBP and studying its optical properties.

Main Methods:

Developed a new method for preparing twisted black phosphorus (TBP).
Utilized a custom polarimeter microscope for optical rotation mapping.
Fabricated an air/BP/SiO2/Si Fabry-Pérot cavity for measurements.

Main Results:

Observed a large polarization-plane rotation (PORA) of 0.49° per atomic layer at 600 nm, an order of magnitude higher than previous reports.
Demonstrated tunable PORA from 0.48° to 7.75° by varying the twist angle from 0° to 90° for a fixed thickness.
Achieved a significant enhancement in optical rotation compared to existing studies.

Conclusions:

Twisted black phosphorus (TBP) offers a highly tunable platform for optical anisotropy.
The developed methods facilitate the investigation of 2D material heterojunctions.
TBP holds promise for designing novel tunable nanoscale polarization controllers and optoelectronic devices.