Ultra-thin wide spectrum holographic antenna

Abstract

The invention relates to a holographic optical antenna device which comprises a light ray propagation base, at least one coupling grating and at least one channel grating are recorded on the base, wherein the coupling grating is an input grating and used for leading a space optical with a certain aperture angle coupling to enter into the base, transforming optical waves with different wavelengths in a finite aperture to plane waves with a certain tilted phase, carrying out full-reflection propagation in the base, and carrying out a certain spectrum separation on incident optical waves with the different wavelengths. At least one channel grating can lead the plane waves which are incident on the channel grating to couple and emerge, and further lead the waves to enter into a follow-up photoelectric conversion and signal processing circuit, thereby obtaining information carried in input light and realizing the functions of the antenna. The optical antenna has the advantages of low manufacturing cost and small installation and adjustment difficulty, does not depend on a lens system and can simultaneously meet the requirements on ultra-thin size and large aperture.

Description

technical field [0001] The invention relates to a holographic optical element, in particular to an ultra-thin wide-spectrum holographic antenna to realize the function of an optical antenna in free space and perform photoelectric conversion. Background technique [0002] While the optical fiber communication technology used on the ground is maturing day by day, people focus their attention on free space optical communication. Free space optical communication is the product of optical fiber communication and wireless communication. It uses laser as a carrier and uses optical pulse modulation signal to transmit information in vacuum or atmosphere. It includes satellite optical communication, satellite-ground optical communication and atmospheric optical communication. Compared with the traditional wireless communication method using electromagnetic waves, free space optical communication has the advantages of narrow emission beam, large information capacity, small emission dev...

AI Technical Summary

Problems solved by technology

However, with the increase in the amount of information transmitted by wireless communication and the interference of various obstacles in the propagation space, the requirements for the aperture of the collection lens continue to increase. The increase in aperture is accompanied by the strengthening of the collection / transmission signal but also brings a series of problems. technical challenge

Large-diameter optical lenses are difficult to manufacture, resulting in a substantial increase in cost, and large-sized optical lenses are generally bulky, which brings difficulties to installation such as adjustment and alignment, greatly affects the effect of optical antennas, and limits the space Development of Optical Communication Technology

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