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An all-photonic isolator using atomically thin (2D) bismuth telluride (Bi2Te3)
Saswata Goswami1, Bruno Ipaves2, Juan Gomez Quispe2
1School of Nano Science and Technology, Indian Institute of Technology, Kharagpur, West Bengal-721302, India.
Nanoscale
|May 1, 2026
Summary
Two-dimensional bismuth telluride (2D Bi2Te3) exhibits a strong nonlinear optical response, enabling nonreciprocal light propagation. This novel 2D material advances passive photonic isolators and other photonic devices.
Area of Science:
- Nonlinear optics
- Materials science
- Condensed matter physics
Background:
- Two-dimensional (2D) materials offer unique optical properties.
- Photonic isolators are crucial for controlling light propagation direction.
- Bismuth telluride (Bi2Te3) is a promising material for optical applications.
Purpose of the Study:
- To investigate the nonlinear optical properties of 2D Bi2Te3.
- To demonstrate a passive photonic isolator using 2D Bi2Te3.
- To explore the potential of 2D Bi2Te3 in photonic devices.
Main Methods:
- Spatial self-phase modulation (SSPM) spectroscopy to measure nonlinear optical parameters.
- Fabrication of a 2D-Bi2Te3-2D-hBN heterostructure.
- Characterization of light propagation in the heterostructure.
Main Results:
- 2D Bi2Te3 shows a broadband Kerr nonlinear optical response.
- Significant nonlinear refractive index (≈10-4 cm2 W-1) and third-order nonlinear susceptibility (≈10-7 e.s.u.).
- Successful demonstration of a nonlinear photonic isolator enabling unidirectional light propagation.
Conclusions:
- 2D Bi2Te3 possesses enhanced Kerr nonlinearity, surpassing graphene.
- The demonstrated photonic isolator utilizes the 2D-Bi2Te3-2D-hBN heterostructure.
- 2D Bi2Te3 is a novel material with potential for detectors, modulators, and switches.
