Metasurface THz Deflector Using Liquid Crystal Blazed Grating
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Solution Overview
Problem
Existing THz signal deflectors are bulky, have low efficiency, a narrow modulated band range, and poor tunability, making them unsuitable for dynamic and wide-band THz signal deflection in practical applications.
Innovation Solution
A modulated THz signal deflector is designed using oppositely disposed transparent substrates with a liquid crystal layer in between, equipped with transparent electrode layers and photo-alignment layers that control the liquid crystal molecule directors to form a blazed-grating phase distribution, deflecting incident circularly polarized THz signals to a specific angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a prism or inclined phase plate is used as a THz signal deflector, then the deflection function is achieved, but the device becomes bulky and difficult to miniaturize
Solution Approach 1:
The patent replaces traditional mechanical optical elements (prisms, phase plates) with a metasurface-based THz signal deflector. The metasurface uses subwavelength resonant structures to achieve phase modulation and signal deflection through electromagnetic field interaction rather than mechanical geometry, enabling miniaturization while maintaining deflection functionality.
Solution Approach 2:
The patent employs a thin-film metasurface structure with periodic patterns to achieve THz signal deflection. This thin-film approach replaces bulky three-dimensional optical elements with a two-dimensional planar structure, significantly reducing device volume while preserving the essential deflection function through engineered electromagnetic response.
2Volume of moving object
If a metasurface-based THz signal deflector is used, then miniaturization is achieved, but efficiency and tunability deteriorate
Solution Approach 1:
The patent introduces dynamic tunability to the metasurface deflector by enabling real-time adjustment of the deflection angle and modulation characteristics. This dynamic capability allows the device to adapt to different operating conditions and frequency ranges, significantly improving modulation efficiency and versatility compared to static metasurface designs.
Solution Approach 2:
The patent achieves improved efficiency by dynamically adjusting key parameters such as the deflection angle, operating frequency, and modulation depth. Through parameter optimization and real-time tuning, the metasurface deflector overcomes the efficiency limitations of fixed designs while maintaining its compact form factor.
3Volume of moving object
If a metasurface-based THz signal deflector is used, then miniaturization is achieved, but the modulated band range narrows
Solution Approach 1:
The patent implements dynamic reconfigurability in the metasurface deflector, enabling real-time adjustment of the modulated band range. This dynamic capability allows the device to adapt to different frequency ranges and application requirements, significantly expanding the operational bandwidth compared to fixed metasurface designs.
Solution Approach 2:
The patent designs the metasurface deflector with multi-functional capabilities to operate across a wide frequency range. By incorporating tunable elements and adaptive control mechanisms, the device can serve multiple applications and frequency bands, enhancing versatility while maintaining miniaturization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves dynamic, efficient, and wide-band THz signal deflection, enabling miniaturization and integration, with flexible exposure patterns allowing for various deflection angles, enhancing its application potential in THz communication and other fields.
Implementation Method 1
the control graph is configured to control a liquid crystal molecule director in the liquid crystal layer to be periodically and gradiently distributed along a specific direction to form a blazed-grating phase distribution based on a geometric phase
Implementation Method 2
deflect an incident circularly polarized THz signal to a specific angle
Data Source
AI summary
Disclosed are a modulated terahertz (THz) signal deflector and a preparation method thereof. The modulated THz signal deflector includes: a first transparent substrate and a second transparent substrate that are oppositely disposed, a liquid crystal layer, a transparent electrode layer, and a photo-alignment layer, wherein the photo-alignment layer has a control graph in which a molecule director is periodically and gradiently distributed along a specific direction, and the control graph is configured to control a liquid crystal molecule director in the liquid crystal layer to be periodically and gradiently distributed along a specific direction to form a blazed-grating phase distribution based on a geometric phase, and deflect an incident circularly polarized THz signal to a specific angle. The deflector provided in the present disclosure can deflect a THz signal to a specific angle, and can switch signal deflection and non-deflection functions by powering up a transparent electrode.