A device and method for detecting orbital angular momentum of light field
A technology for orbital angular momentum and light detection, applied in the field of vortex optical field and optics, it can solve the problem of not being able to take into account the real-time detection and large detection range of miniaturized devices at the same time, and achieve easy comparison, easy integration, and strong scalability. Effect
Inactive Publication Date: 2017-01-25
SOUTHEAST UNIV
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[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a device and method for detecting the orbital angular momentum of light field, which is used to solve the problem that the existing detection technology cannot take into account miniaturized devices, real-time detection and large detection range at the same time technical flaws
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[0031] The present invention will be further described below in conjunction with the accompanying drawings.
[0032] Such as figure 1 As shown, a detection device for detecting the orbital angular momentum of a light field can be divided into four parts: a metaholographic surface assembly 2 , a coupling grating 3 , a silicon dioxide substrate 4 and a silicon-based detector 5 . Such as figure 2 As shown, the metaholographic surface set 2 is divided into four metaholographic surfaces A, B, C, and D with equal areas, and each metaholographic surface is evenly arranged around the geometric center of the metaholographic surface set 2, And the structural topological charges of each metaholographic surface are different, the structural topological charges of the four blocks A, B, C, and D are -1, 1, 2, -2 respectively. The design of the metaholographic surface is based on the interference pattern between the surface plasmon wave and the vortex light field propagating in free space...
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The invention discloses a device and a method for detecting an orbital angular momentum of a light field. The device consists of an ultra-sensitive holographic surface set, a coupling grating, a silicon dioxide substrate and silicon detectors. By the method, a holographic function is integrated on a metal micro-nano structure to form ultra-sensitive holographic surfaces. Each holographic surface has a plurality of regions with different topological charges, a to-be-detected vortex light field with a radial polarized component can be coupled into a plurality of surface plasma wave focusing fields, and spreading directions of the surface plasma wave focusing fields depend on a total angular momentum of a system. After being transmitted by the coupling grating, focusing surface plasma waves generated in various regions of each holographic surface can be collected by the silicon detectors. Signals of the detectors are quantified, and large-range high-fidelity recognition on the orbital angular momentum of the light field can be implemented. Compared with the traditional method for detecting an orbital angular momentum of a light field, the method for detecting the orbital angular momentum of the light field has the advantages of microminiaturization, easiness in integration, large detection range, real-time detection capability and the like. The device and the method for detecting the orbital angular momentum of the light field can be applied to various fields of light communication and information processing.
Description
technical field [0001] The invention relates to the field of optics, in particular to the field of vortex light fields. Background technique [0002] The vortex light field refers to a special kind of light field with spiral phase wavefront or phase singularity, and its phase distribution on the light field cross section can be described as exp(ilφ), where φ represents the azimuth angle, l represents the topological charge , here and the orbital angular momentum carried by each photon is As a characteristic of the vortex light field, the topological charge l can be any integer, representing the number of times the light field is twisted within one wavelength. The vortex optical field has many special properties, such as infinite state space, hollow ring distribution of intensity, etc., and has a wide range of applications in the fields of biological optical tweezers, high-dimensional data storage, and free space optical communication. The value of the orbital angular mome...
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IPC IPC(8): G01J1/42
Inventor 芮光浩詹其文崔一平
Owner SOUTHEAST UNIV