Tunable terahertz metamaterial for high-efficiency switch application

Ou, Huiliang; Lu, Fangyuan; Liao, Yuehua; Zhu, Fengdi; Lin, Yu‐Sheng

doi:10.1016/j.rinp.2019.102897

Cited by 44 publications

(17 citation statements)

References 47 publications

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“…dual-band filtering and switching characteristics ( Figure 6(i)), [96] a multifunctional split-disk resonator THz metamaterial ( Figure 6(j)), [97] a three-dimensional double split-ring resonators with high tuning range ( Figure 6(k)) [98] and three-coaxial-complementary-SRR metamaterial with single-/dual-band switching tunability ( Figure 6(l)). [99] The fruitful results provide the reconfigurable THz metamaterials to possess multifunctional characteristics.…”

Section: Reconfigurable Thz Metamaterialsmentioning

confidence: 99%

“…[85] In the Lin's research group, they proposed a series of THz metamaterial sensors and switches, such as three designs of tunable multi-resonance of THz metamaterials composed of single-, dual-, and triple-split-disk resonators (Figure 6(h)), [95] a tunable THz metamaterial with single-band and Figure 6. Reconfigurable metamaterials in THz spectrum range for (a and b) absorbers, [90,91] (c and d) polarizers, [75,92] (e and f) filters, [93,94] (g and h) sensors, [85,95] and (i-l) switches [96][97][98][99] applications.…”

Section: Reconfigurable Thz Metamaterialsmentioning

confidence: 99%

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Reconfigurable metamaterials for optoelectronic applications

Lin

2020

International Journal of Optomechatronics

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Section: Reconfigurable Thz Metamaterialsmentioning

confidence: 99%

Section: Reconfigurable Thz Metamaterialsmentioning

confidence: 99%

Reconfigurable metamaterials for optoelectronic applications

Lin

2020

International Journal of Optomechatronics

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“…Their response to radiation also depends on its angle of incidence and polarisation. The unit cells of FSS are mainly represented by split ring resonators [30], wires [31], chiral and cross-like elements [32,33], holes or patches of different configuration, etc [34].…”

Section: Introductionmentioning

confidence: 99%

FEM Simulation of Frequency-Selective Surface Based on Thermoelectric Bi-Sb Thin Films for THz Detection

et al. 2021

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Terahertz (THz) filters and detectors can find a wide application in such fields as: sensing, imaging, security systems, medicine, wireless connection, and detection of substances. Thermoelectric materials are promising basis for THz detectors’ development due to their sensitivity to the THz radiation, possibility to be heated under the THz radiation and produce voltage due to Seebeck effect. Thermoelectric thin films of Bi-Sb solid solutions are semimetals/semiconductors with the band gap comparable with THz energy and with high thermoelectric conversion efficiency at room temperature. Detecting film surface can be transformed into a periodic frequency selective surface (FSS) that can operate as a frequency filter and increases the absorption of THz radiation. We report for the first time about the simulation of THz detector based on thermoelectric Bi-Sb thin-filmed frequency-selective surface. We show that such structure can be both detector and frequency filter. Moreover, it was shown that FSS design increases not only a heating due to absorption but a temperature gradient in Bi-Sb film by two orders of magnitude in comparison with continuous films. Local temperature gradients can reach the values of the order of 100 K· mm−1. That opens new perspectives for thin-filmed thermoelectric detectors’ efficiency increase. Temperature difference formed due to THz radiation absorption can reach values on the order of 1 degree. Frequency-transient calculations show the power dependence of film temperature on time with characteristic saturation at times around several ms. That points to the perspective of reaching fast response times on such structures.

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“…By tailoring the geometrical dimensions, metamaterials can be designed to span broad operating wavelengths, including visible [ 31 , 32 , 33 ], IR [ 34 , 35 , 36 , 37 , 38 , 39 ], terahertz [ 40 , 41 , 42 , 43 , 44 ], and microwave light [ 45 , 46 ]. To provide metamaterials with more flexibility, there are many techniques proposed for tuning mechanisms using MEMS technology [ 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ]: liquid crystal [ 55 ], photo-excited [ 56 ], phase-change materials [ 57 , 58 ], thermal annealing [ 59 ], and so on. One important tuning method for metamaterial emitters is the integration of microheaters and metamaterials owing to their high efficiency.…”

Section: Introductionmentioning

confidence: 99%

Tunable Infrared Metamaterial Emitter for Gas Sensing Application

Lin

2020

Nanomaterials

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We present an on-chip tunable infrared (IR) metamaterial emitter for gas sensing applications. The proposed emitter exhibits high electrical-thermal-optical efficiency, which can be realized by the integration of microelectromechanical system (MEMS) microheaters and IR metamaterials. According to the blackbody radiation law, high-efficiency IR radiation can be generated by driving a Direct Current (DC) bias voltage on a microheater. The MEMS microheater has a Peano-shaped microstructure, which exhibits great heating uniformity and high energy conversion efficiency. The implantation of a top metamaterial layer can narrow the bandwidth of the radiation spectrum from the microheater to perform wavelength-selective and narrow-band IR emission. A linear relationship between emission wavelengths and deformation ratios provides an effective approach to meet the requirement at different IR wavelengths by tailoring the suitable metamaterial pattern. The maximum radiated power of the proposed IR emitter is 85.0 µW. Furthermore, a tunable emission is achieved at a wavelength around 2.44 µm with a full-width at half-maximum of 0.38 µm, which is suitable for high-sensitivity gas sensing applications. This work provides a strategy for electro-thermal-optical devices to be used as sensors, emitters, and switches in the IR wavelength range.

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Tunable terahertz metamaterial for high-efficiency switch application

Cited by 44 publications

References 47 publications

Reconfigurable metamaterials for optoelectronic applications

Reconfigurable metamaterials for optoelectronic applications

FEM Simulation of Frequency-Selective Surface Based on Thermoelectric Bi-Sb Thin Films for THz Detection

Tunable Infrared Metamaterial Emitter for Gas Sensing Application

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