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Folded Digital Meta-Lenses for on-Chip Spectrometer
Zimeng Zhang1,2, Yingjie Liu1,2, Zi Wang1,2
1Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems, Harbin Institute of Technology, Shenzhen 518055, P. R. China.
Nano Letters
|April 11, 2023
Summary
We developed a digital meta-lens for compact on-chip spectrometers. This novel meta-surface design offers improved beam control and high-resolution spectral analysis within a small footprint.
Area of Science:
- Photonics
- Optical Engineering
- Materials Science
Background:
- Diffractive optical networks using meta-surfaces are limited by regular antenna unit design constraints.
- Existing meta-surface systems often require large footprints due to cascaded designs.
Purpose of the Study:
- To propose a digital meta-lens with enhanced design freedom for improved optical functionalities.
- To develop a compact, high-resolution on-chip spectrometer using meta-lenses.
Main Methods:
- Designed a digital meta-lens with a high degree of design freedom.
- Constructed a highly dispersive and compact diffractive optical system using five layers of meta-lenses in a folded configuration.
- Utilized a silicon photonic platform for device fabrication.
Main Results:
- Achieved significantly improved beam focusing, collimation, and deflection capabilities.
- Demonstrated sparse and continuous spectra reconstruction over a 35 nm bandwidth.
- Resolved fine spectral lines with a resolution of 0.14 nm.
- The spectrometer occupied a chip area of only 100 μm × 100 μm.
Conclusions:
- The digital meta-lens offers a versatile platform for compact, high-resolution on-chip spectrometers.
- The design's versatility makes it promising for applications in imaging, optical computing, and beyond.
