A tunable terahertz wavefront modulator and its preparation method
A wavefront modulation and terahertz technology, applied in the field of terahertz optoelectronics, can solve the problem of single function of terahertz modulator
Active Publication Date: 2021-05-18
南京晶萃光学科技有限公司 +2
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Problems solved by technology
[0004] The present invention provides an adjustable terahertz wavefront modulator and its preparation method to solve the technical problem of the single function of the terahertz modulator in the prior art
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[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.
[0043] Terahertz waves are electromagnetic waves with a frequency between 0.1-10 THz (corresponding to a wavelength of 30-3000 μm). Terahertz waves have the following unique properties: 1) low photon energy, suitable for biopsy of biological tissues; 2) skeletal vibration and rotational energy levels of many biomolecules and condensed matter, as well as intermolecular interaction energy levels (hydrogen bonds, etc.) are in the terahertz frequency band; 3) many non-metallic and non-polar materials have small absorp...
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Abstract
The invention discloses a terahertz wavefront modulator and a preparation method thereof. The terahertz wavefront modulator includes a first substrate and a second substrate oppositely arranged, a subwavelength metal wire grid interdigitated electrode, a metal metasurface, a first An alignment layer, a second alignment layer, and a liquid crystal layer, the metal metasurface includes multiple nested structures, each nested structure includes an outer closed ring and an inner split ring; the first alignment layer and the second alignment layer have the same alignment direction , the alignment direction is perpendicular to the grating vector direction of the metal wire grid of the sub-wavelength metal wire grid interdigitated electrode; the liquid crystal layer is arranged between the first alignment layer and the second alignment layer. The initial deflection direction of the liquid crystal in the liquid crystal layer is controlled by the first alignment layer and the second alignment layer, and the deflection direction of the liquid crystal in the liquid crystal layer under the action of an electric field is controlled by the subwavelength metal wire grid interdigitated electrode and the metal metasurface to ensure full terahertz The polarization selectivity and high transmittance in the frequency range guarantee the realization of a multifunctional terahertz wavefront dynamic modulator.
Description
technical field [0001] Embodiments of the present invention relate to terahertz optoelectronic technology, and in particular to a terahertz wavefront modulator and a manufacturing method thereof. Background technique [0002] Terahertz waves are electromagnetic waves with a frequency between 0.1-10THz (corresponding to a wavelength of 30-3000μm). Due to their unique properties, terahertz technology has broad application prospects in many fields such as security inspection, biomedicine, and high-speed wireless communication. . Compared with terahertz sources and detectors, high-performance photonic devices for transmitting and controlling terahertz waves are still in their infancy, especially dynamically tunable terahertz devices. [0003] In recent years, liquid crystal materials have been widely used in the development of tunable terahertz modulators, such as phase shifters, wave plates, and vortex light generators, due to their broadband electrically controlled birefringe...
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IPC IPC(8): G02F1/1343G02F1/1337G02F1/1339G02F1/1335
CPCG02F1/1335G02F1/133528G02F1/1337G02F1/133788G02F1/13392G02F1/1343G02F1/133548
Inventor 葛士军胡伟沈志雄袁瑞
Owner 南京晶萃光学科技有限公司