This paper presents a novel sub-terahertz liquid crystal (LC) phase shifter based on digital coding metasurfaces. The proposed structure consists of metal gratings and resonant structures. They are both immersed in LC. The metal gratings function as reflective surfaces for electromagnetic waves and electrodes for controlling the LC layer. The proposed structure changes the state of the phase shifter by switching the voltage on every grating. It allows the deflection of LC molecules within a subregion of the metasurface structure. Four switchable coding states of the phase shifter are obtained experimentally. The phase of the reflected wave varies by 0°, 102°, 166°, and 233° at 120 GHz. Due to the presence of the transverse control electric field, modulation speed is approximately doubled compared to the free relaxation state. This work provides a novel idea for wavefront modulation of phase.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OE.486146 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The cross talk and power consumption of the 2 × 2 optical switch is a key metric in the design of large-scale photonic integrated circuits (PICs). We build a theoretical model of a 2 × 2 Mach-Zehnder interferometer (MZI) optical switch, taking into account both imbalances in the arm loss and the coupler splitting ratio. The splitting ratio imbalance requirement for a given switch cross talk is summarized, which provides a guideline for the switch design.
View Article and Find Full Text PDFA 14 μHz/√Hz resolution and 32 μHz bias instability MEMS quartz resonant accelerometer with a low-noise oscillating readout circuit.
Microsyst Nanoeng
December 2024
State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, 710049, Xi'an, China.
A differential microelectromechanical system (MEMS) quartz resonant accelerometer with a novel oscillating readout circuit is proposed. The phase noise in a piezoelectric quartz resonant accelerometer has been systematically investigated. A high-performance front-end is used to extract the motional charge from a piezoelectric quartz resonator for the first time.
View Article and Find Full Text PDFWe propose a continuously tunable low-loss phase shifter based on weak-dispersion spoof surface plasmon polariton (SSPP) waveguide. Unlike traditional designs of SSPP devices that rely on the strong-dispersion property, we address the high insertion loss issue by leveraging the weak-dispersion region of SSPP. A detailed study reveals the relation between the waveguide length, phase shift, and insertion loss of SSPP.
View Article and Find Full Text PDFThis work presents the generation of an Airy beam by a leaky-wave structure (LWS) designed from a substrate-integrated waveguide (SIW) with dimension-varying slots. The Airy beam is radiated by judiciously designing the length of the slots to modulate the phase distribution. Compared to Airy beams generated by phased array antennas or metasurfaces, no complex feeding network associated with phase shifters and no space-wave illumination is required, thus allowing one to reach a low-profile structure.
View Article and Find Full Text PDFArticle Synopsis
- The study focuses on enhancing the performance of PEDOT: PSS, a conductive polymer used for flexible transparent electrodes, which traditionally faced limitations in research and application.
- The newly developed electrode features high conductivity (up to 1300 S cm) and excellent transparency across a wide range of wavelengths, from visible light to terahertz frequencies, enabled by DMSO doping.
- The transparent electrode demonstrates remarkable stability throughout extensive electrical cycling and high temperatures, leading to its successful application in creating a liquid crystal phase shifter with improved driving performance.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!