Free space light and photon chip end face coupling method
An end-face coupling and free space technology, applied in the field of micro-nano optics, can solve the problems of low efficiency and achieve the effect of promoting development and application
Pending Publication Date: 2021-12-24
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology
[0005] However, the coupling between free-space light and waveguide, no matter it is end-face coupling or grating (vertical) coupling, is affected by the mode-field mismatch problem, and the efficiency is very low. Therefore, it is urgent to develop new coupling technologies to improve coupling efficiency and promote photonic chips. Application system development
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[0029] The present disclosure provides a method for coupling free-space light to the end face of a photonic chip, using a super-surface thin-film microlens (super-lens) to increase the light-receiving area to improve the coupling efficiency of free-space light and a photonic chip, through the aperture of the super-lens and the end-face coupler Matching greatly improves the light-receiving ability of the photonic chip.
[0030] The inventors found that the metalens, as an artificial nanostructure, can modulate the intensity and phase of the spatial light field through the design of the unit structure and arrangement, so as to realize the function of converging light. Its main features are ultra-thin, designable, controllable, and matching with the size and mode field of on-chip photonic devices (waveguides, couplers, etc.). It is processed by standard photolithography, electron beam exposure and etching methods, and is compatible with CMOS technology. The F-number of the metal...
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The invention provides a free space light and photon chip end face coupling method. The method comprises the steps that: at least one end face coupler is arranged at the focal length of a super lens; free space light is converged to a light receiving port of the end face coupler through the super lens; and light matched with the end face coupler in light receiving angle, direction and waveguide mode field is coupled into a waveguide of the end face coupler through the end face coupler. In the prior art, the end face coupling of free space light and a waveguide is influenced by energy dispersion, angle mismatch, mode field mismatch, small size of grating or end face coupler spot size and the like, and the free space light collected by a coupling device of a chip is very low in power. With the method adopted, the above technical problems can be solved.
Description
technical field [0001] The present disclosure relates to the field of micro-nano optics technology, in particular to a method for coupling free-space light to an end face of a photonic chip. Background technique [0002] Information technology in the post-Moore era has become the focus of attention of the international community. Silicon photonic chip technology, which combines the ultra-large-scale, ultra-high-precision manufacturing of microelectronics technology and the advantages of ultra-high speed and ultra-low power consumption of photonic technology, is considered to be the most potential high-efficiency, low-cost on-chip solution. Optical coupling is the key core technology of photonic chips. Currently, it faces the problems of low coupling efficiency and difficult integration. This is mainly due to the small size of the waveguide and the difficulty in matching the mode with the fiber or free space light, resulting in a very large coupling loss. Therefore, it is n...
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IPC IPC(8): G02B6/32G02B6/12
CPCG02B6/32G02B6/12G02B2006/12102G02B2006/12176G02B2006/12171
Inventor 韩春蕊刘思远王宇罗艳陈卓曲壮壮周维虎亓岩范元媛路建明
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI