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π-phase modulated monolayer supercritical lens.

Fei Qin¹, Boqing Liu², Linwei Zhu³

¹Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, 510632, China.

Nature Communications

|January 5, 2021

Summary

Researchers achieved wavefront engineering using atomically thin molybdenum disulfide (MoS₂) on ZnO/Si. This enables ultra-compact optical devices with sub-diffraction-limited focusing across a broad wavelength range.

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Area of Science:

Optoelectronics
Materials Science
Nanotechnology

Background:

Monolayer transition metal dichalcogenides offer unique properties for miniaturized devices.
Wavefront engineering in 2D materials is challenging due to minimal thickness and suppressed phase accumulation.

Purpose of the Study:

To demonstrate wavefront engineering in monolayer MoS₂ by leveraging loss-assisted singular phase behavior.
To enable ultra-compact optical elements with broadband phase modulation capabilities.

Main Methods:

Integration of monolayer MoS₂ on a planar ZnO/Si substrate.
Exploitation of loss-assisted singular phase behavior near critical coupling.
Characterization of broadband phase regulation and sub-diffraction-limited focusing.

Main Results:

Achieved a π phase jump in monolayer MoS₂, overcoming thickness limitations.
Demonstrated binary phase-modulated supercritical lenses with constant sub-diffraction-limited focal spots (0.7 AU).
Enabled broadband phase modulation from blue to yellow wavelengths.

Conclusions:

Atomically thin optical elements can be realized using 2D semiconductor platforms.
This work opens new avenues for ultra-compact optoelectronic systems with integrated functionalities.
Loss-assisted singular phase behavior is a viable mechanism for wavefront engineering in 2D materials.