Dynamic switching of coaxial focus based on terahertz meta-lens

Yin, Shimin; Liang, Yuanyuan; Zeng, Dehui; Tian, Yangyang; Zhong, Pei; Guo, Ling; Huang, Wei; Zhang, Wentao

doi:10.1364/ao.421906

Cited by 8 publications

(7 citation statements)

References 27 publications

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“…In our previous work [ 11 ], the amplitude and phase of C-shaped SRRs were investigated. We chose eight pairs of specific parameters ( a and r ) of SRRs, as listed in Table 1 , and their transmission phases and amplitudes at 0.8 THz are shown in Figure 2 .…”

Section: Design and Simulationmentioning

confidence: 99%

“…With well-designed structures, metasurfaces can modulate the amplitude [ 4 , 5 , 6 ], phase [ 7 ], polarization [ 8 ], and chirality [ 9 ]. Owing to their excellent ability of control the wavefront with a phase-gradient configuration, metasurfaces have been developed for various functional devices like the meta-lens [ 10 , 11 ], beam splitter [ 12 , 13 ], and vortex generator [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Optically Controlled Terahertz Dynamic Beam Splitter with Adjustable Split Ratio

et al. 2022

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The beam splitter is an important functional device due to its ability to steer the propagation of electromagnetic waves. The split-ratio-variable splitter is of significance for optical, terahertz and microwave systems. Here, we are the first (to our knowledge) to propose an optically controlled dynamic beam splitter with adjustable split ratio in the terahertz region. Based on the metasurface containing two sets of reversed phase-gradient supercells, we split the terahertz wave into two symmetrical beams. Associated with the reconfigurable pump laser pattern programmed with the spatial light modulator, dynamic modulation of the split ratio varying from 1:1 to 15:1 is achieved. Meanwhile, the beam splitter works at a split angle of 36° for each beam. Additionally, we obtain an exponential relationship between the split ratio and the illumination proportion, which can be used as theoretical guidance for beam splitting with an arbitrary split ratio. Our novel beam splitter shows an outstanding level of performance in terms of the adjustable split ratio and stable split angles and can be used as an advanced method to develop active functional devices applied to terahertz systems and communications.

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Section: Design and Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optically Controlled Terahertz Dynamic Beam Splitter with Adjustable Split Ratio

et al. 2022

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“…Researchers have designed a large number of functional devices in terahertz band, such as superstructure lens [3], sensor [4], modulator [5] , encoder [6] and so on. Some researchers have focused on field-enhanced terahertz devices.…”

Section: Introductionmentioning

confidence: 99%

Field enhancement effect in graphene-based terahertz nano metasurfaces

Qin

Xie

Yin

2023

14th International Photonics and Optoelectronics Meetings (POEM 2022)

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In the paper, we discuss the field enhancement effect in terahertz nano metasurfaces. The unit cell of the metasurfaces consists of a metallic split ring resonator (SRR) connecting with a wire. When the gap of SRR varies from micron-scale to nano-scale, the field enhancement factor in the gap achieves an order-of-magnitude increase in nano metasurfaces compared to that of micron metasurfaces. We then apply the nano metasurfaces to electric field sensing by assembling a layer of graphene film. In the simulation, the conductivity of graphene is tuned by varying the scattering time (relaxation time) corresponding to the varying external voltage. Compared to the structure without graphene film, the transmission of the graphene-based metasurfaces will be modulated by graphene conductivity. And the conduction effect of the graphene-based metasurfaces with nanogap under the same voltage is much better than that of the structure with micron gap, due to the extreme high field enhancement of the former. Based on this study, we can further optimize the nano metasurfaces for high sensitivity sensing, which can be applied in biological/chemical sensors or nonlinear devices.

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“…In the aspect of terahertz system design, Yin et al proposed an active meta‐lens composed of two concentric sets of complementary split‐ring resonator arrays that could dynamically switch the coaxial focus on three statuses 34 . In the same year, multilayer high transmission gradient metasurfaces are employed by Liu et al to design both high NA and large focusing efficiency metalenses in the low spectrums 35 .…”

Section: Introductionmentioning

confidence: 99%

“…In the aspect of terahertz system design, Yin et al proposed an active meta-lens composed of two concentric sets of complementary split-ring resonator arrays that could dynamically switch the coaxial focus on three statuses. 34 In the same year, multilayer high transmission gradient metasurfaces are employed by Liu et al to design both high NA and large focusing efficiency metalenses in the low spectrums. 35 Tamminen et al studied the design, simulation, and characterization of a quasioptical system for submillimeter-wave quantification for corneal to observe the dynamic changes in artificial tear-film, thickness, and water content.…”

Section: Introductionmentioning

confidence: 99%

Design and energy research of terahertz optical systems for cell stimulation

Guan

Liu

et al. 2022

Micro & Optical Tech Letters

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Terahertz technology has its unique advantages in the field of biomedicine and is increasingly used in modern medical applications. In this study, to research the responding of biological tissues (cells or nerve nuclei) to various terahertz energy stimulation, an automatic terahertz energy control optical system is designed. The ray tracing simulation of the selfdesigned optical lens model is conducted and the results show that the system can achieve the focusing arrangement within 90 mm and control the strength of terahertz energy on image plane. In addition, an automatic control system with nanometer-level precision is designed using a stepper motor subdivision scheme to coordinate with the image plane (target point) energy and morphology adjustment. Then biomedical experiments based on this system are carried out. Through adjusting the system, terahertz intensity on cells is changed, so that the cells show various cell viabilities. The optimized experimental results show that the terahertz energy automatic control optical system designed in this study is qualified for terahertz energy irradiation research with biological cells.

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Dynamic switching of coaxial focus based on terahertz meta-lens

Cited by 8 publications

References 27 publications

Optically Controlled Terahertz Dynamic Beam Splitter with Adjustable Split Ratio

Optically Controlled Terahertz Dynamic Beam Splitter with Adjustable Split Ratio

Field enhancement effect in graphene-based terahertz nano metasurfaces

Design and energy research of terahertz optical systems for cell stimulation

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