Creating emissions from photonic integrated circuits (PICs) to free space currently relies on grating couplers and inverse tapers. The ability to shape the free space emission from PICs with more versatility can open up new possibilities for various applications, such as light detection and ranging (LiDAR), chip-scale optogenetic probes, and quantum photonics.
We have developed a monolithic platform to integrate metasurfaces on silicon PICs. The fabrication process is CMOS-compatible. The metasurface is evanescently coupled to the guided mode, creating emission with determined phase and amplitude. We show switchable diffraction-limited focal spots and holographic image projection in the free space.
Relevant Publications:
- Metasurfaces on silicon photonic waveguides for simultaneous emission phase and amplitude control, Ping-Yen Hsieh, Shun-Lin Fang, Yu-Siang Lin, Wen-Hsien Huang, Jia-Min Shieh, Peichen Yu, You-Chia Chang, Optics Express 31, 12487-12496 (2023)
- Integrated Metasurfaces on Silicon Photonics for Emission Shaping and Holographic Projection, Ping-Yen Hsieh, Shun-Lin Fang, Yu-Siang Lin, Wen-Hsien Huang, Jia-Min Shieh, Peichen Yu, You-Chia Chang, Nanophotonics 11, 4687-4695 (2022).
- Shaping Free-space Emission with Monolithically Integrated Metalenses on Silicon Photonic Waveguides, Ping-Yen Hsieh, Yu-Siang Lin, Shun-Lin Fang, and You-Chia Chang, in CLEO, p. SM4P.7 (2022).
- Metasurfaces on Silicon Photonics for Simultaneous Emission Amplitude and Phase Control, Yu-Siang Lin, Ping-Yen Hsieh, Shun-Lin Fang, and You-Chia Chang, in CLEO, p. FF2D.8 (2022).