Wavefront-controllable all-silicon terahertz meta-polarizer

Li, Jitao; Yue, Zhen Xing; Li, Jie; Zheng, Chenglong; Liu, Jingyu; Yang, Fan; Li, Hui; Zhang, Yating; Zhang, Yan; Yao, Jianquan

doi:10.1007/s40843-022-2126-0

Cited by 18 publications

(6 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The femtosecond laser modulated by the THz electric field is collected by a CCD camera, and the time‐domain signal transmitted at the focal plane is obtained. [ 30 ] Then, a schematic diagram of the electric field distribution at the working frequency is obtained by using Fourier transform decoding. The experimental results of the electric field profiles at the focal plane are shown in Figure 7c,d.…”

Section: Resultsmentioning

confidence: 99%

All‐Silicon Diatomic Terahertz Metasurface with Tailorable Linear Polarization States

Zheng

et al. 2022

Advanced Optical Materials

Self Cite

View full text Add to dashboard Cite

exploring novel polarization generation methods has always been a key strategy to improve the efficiency of optoelectronic devices. [1,2] A linear polarizer is a specific optical device that can separate a desired linear polarization from unpolarized light, widely used for measurement, [3] detection, [4] and imaging, [5] and provides great convenience for establishing polarization optics systems. [6] Natural light contains a variety of polarization modes, and traditional cascaded optics can separate the light of the desired polarization state. Once the output polarized light has a certain polarization state defined on the surface of the Poincaré sphere, the channel can be independently modulated by introducing a phase modulation profile. [7,8] Conventional phase modulation principles include the propagation phase and geometric phase, the former can act on the circularly polarized and linearly polarized channel, respectively, while the latter is merely for circularly polarized light with conjugate locking distribution. [9] However, traditional optical polarizers based on natural materials, such as half-wave plates (HWPs), quarter-wave plates (QWPs), and beam splitters, are generally bulky and far from the goal of advanced integration and Polarization plays a key role in fundamental science, and the improvement in miniaturization and practicability of polarization conversion devices could provide more degrees of freedom for light-matter interactions. Metasurfaces that can manipulate arbitrary polarization states at subwavelength scales can significantly reduce the complexity of meta-optical systems. Here, a general design of an all-silicon diatomic metasurface operating in the terahertz band that can generate a tailorable linear polarization state by the superposition of two metaatoms with individual geometric parameters is experimentally demonstrated. By periodically arranging polarization-converting and polarization-maintaining meta-atoms, the existence of interference effects enables the proposed diatomic meta-platform to act as an optimal linear polarization operator. The gradient arrangement of the meta-molecules under the profile of the propagation phase is deduced by using the advanced Jones matrix, so that the polarization filtering and wavefront manipulation can be realized simultaneously, including the generation of tightly converged vortex and bifocal focusing beams. This demonstration of generating tailorable linear polarization states located on the Poincaré sphere directly from arbitrarily polarized waves can significantly facilitate the development of functional polarization meta-devices.

show abstract

Section: Resultsmentioning

confidence: 99%

All‐Silicon Diatomic Terahertz Metasurface with Tailorable Linear Polarization States

Zheng

et al. 2022

Advanced Optical Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…10b). 134 Mehta et al 147 assembled a HER-GOR cell using NiMn/OCNT as a catalyst for both cathode and anode, lowering the voltage by 370 mV at a current density of 10 mA cm −2 compared to a HER-OER cell (Fig. 10c), as well as a three-fold increase in hydrogen yield at the cathode and a high selectivity of GRA at the anode.…”

Section: Electrocatalytic Conversion Of Glucose Coupled With Hermentioning

confidence: 99%

Photo-, electro-, and photoelectro-catalytic conversion of glucose into high value-added products

Lu,

Zhang,

Shen

et al. 2024

Catal. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Subsequently, Li et al achieved the conversion from arbitrary to circular polarization in the terahertz (THz) band by the destructive and constructive interference behavior induced by the assembly of meta-atoms with different transverse dimensions into meta-molecules [28]. Although metasurface arrays assembled based on a diatomic interference mechanism are a promising paradigm, most of the reported facts achieve only a single type of polarization conversion behavior, weakening the scenarios for further applications of meta-wave plates [16,[29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Terahertz bi-functional polarization converter based on interference mechanism supported by diatomic metasurfaces

Li,

Xu,

et al. 2024

J. Opt.

Self Cite

View full text Add to dashboard Cite

Polarization manipulation based on the Jones matrix facilitates the enhancement of light-matter interactions. Recently, arbitrarily tailorable polarization states generated with the assistance of a diatomic metasurface effectively reduce the complexity of the system. However, a single polarization switching behavior hinders the application of meta-platforms in cryptographic imaging. Here, we theoretically propose and design a single-layer diatomic all-dielectric metasurface working in the terahertz (THz) band, which can efficiently realize bi-functional polarization switching according to the Jones matrix. Such a meta-platform is assembled from two anisotropic silicon pillars with carefully optimized lateral dimensions and in-plane twist angles. Benefiting from the flexible assembly of half-wave plate (HWP) and quarter-wave plate (QWP), the polarization states generated by the constructed metasurfaces in the transmission mode can be arbitrarily tailored. The feasibility of this diatomic metasurface is further validated by a broadband near-field imaging device, paving the way for broader system applications in cryptographic imaging, data storage, and chiral sensing.

show abstract

Wavefront-controllable all-silicon terahertz meta-polarizer

Cited by 18 publications

References 31 publications

All‐Silicon Diatomic Terahertz Metasurface with Tailorable Linear Polarization States

All‐Silicon Diatomic Terahertz Metasurface with Tailorable Linear Polarization States

Photo-, electro-, and photoelectro-catalytic conversion of glucose into high value-added products

Terahertz bi-functional polarization converter based on interference mechanism supported by diatomic metasurfaces

Contact Info

Product

Resources

About