An EIT-Based Compact Microwave Sensor With Double Sensing Functions

Lin, Xian Qi; Chen, Zhe; Yu, Jia; Liu, Pei Qing; Li, Peng Fei; Chen, Zhizhang

doi:10.1109/jsen.2015.2480800

Cited by 29 publications

(15 citation statements)

References 19 publications

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“…where C1 , C2 is the resonant wavelength of Case 1 and Case 2, respectively. This definition is different from that proposed in [24], which is only suitable for the isotropic rather than anisotropic case. The average FWHM (Full Width Half Maximum) of the sensor in the two cases is 8.…”

Section: Relative Permittivity Extractionmentioning

confidence: 84%

“…The average FWHM (Full Width Half Maximum) of the sensor in the two cases is 8. We have compared the corresponding FoM values of sensing refractive index (permittivity) based on EIT-like sensor with coupled split-ring and spiral structure [23], Jerusalem cross in ring type [24], detuned split ring [31], planar EIT-like metamaterial [32], and our proposed EIT-like sensor. The sensing performance of our EIT-like sensor is comparable with other works as listed in Table 2.…”

Section: Relative Permittivity Extractionmentioning

confidence: 99%

“…On the other hand, the concept of electromagnetically induced transparency (EIT) has gained a lot of attention in the free-space material characterization recently because it features sharp transmission window providing an accurate frequency response to the permittivity [23][24][25]. In addition, the electromagnetic (EM) field is concentrated around the metal layer making the EIT-based sensor insensitive to the thickness of material under test.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the electromagnetic (EM) field is concentrated around the metal layer making the EIT-based sensor insensitive to the thickness of material under test. However, up to now, the EIT-based sensor is only applied in the characterization of isotropic materials by directly curve-fitting [23][24][25] because the field distribution around the EIT structure is complicated and therefore closed form expressions between the complex permittivity and the frequency response is difficult or even impossible to derive. For the anisotropic case, situation gets more complicated and no relevant reports can be found.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of nematic liquid crystals in the THz band based on EIT sensor

Wang¹,

Jin²,

Meng³

et al. 2018

Opt. Express

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This paper introduces the concept of electromagnetically induced transparency (EIT) into the permittivity extraction of an anisotropic material-nematic liquid crystal (NLC). A novel two-step strategy is presented to extract the complex permittivity of the NLC at the THz band, which evaluates the relative permittivity tensor from the resonant frequencies and then determines the loss tangent from the quality factor Q of the EIT sensor. The proposed method features high accuracy due to the sharp resonance of the EIT sensor and also high robustness to the thickness of the NLC layer because only amplitude rather than phase information of the transmission coefficients is required. The NLC filled EIT sensor shows a sensitivity of 56.8 μm/RIU (the resonance wavelength shift over the refractive index change unit (RIU)) and Figure of Merit (FoM) of 6.92. The uncertainty of the proposed technique in the relative permittivity and loss tangent is 3% and 8.2%, respectively.

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Section: Relative Permittivity Extractionmentioning

confidence: 84%

Section: Relative Permittivity Extractionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical investigation of nematic liquid crystals in the THz band based on EIT sensor

Wang¹,

Jin²,

Meng³

et al. 2018

Opt. Express

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show abstract

“…2,3 For example, "at low temperature (8.7 K), an optically tunable delay of 50 ns, is obtained with nearperfect transmission, and superluminal light with a 1.4 μs signal advance". 4 The phenomenon of EIT also can be used for sensors, 5,6 filters, 7,8 and antennas. 9 The EIT effect can be obtained by circuit structures, such as lumped circuit, 10 split ring resonators 11,12 side-coupled Tshaped resonators, 13 asymmetric resonance structures 14,15 and triple-U resonators.…”

Section: Introductionmentioning

confidence: 99%

Group delay modulation based on multimode electromagnetically induced transparency

Chen

Lin

2021

Micro & Optical Tech Letters

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The group delay of passband window plays an important role in the wireless system. Here we propose a controllable group delay structure based on the multimode electromagnetically induced transparency in a closed waveguide system, which is realized by trapping three “dark” modes with high Q‐factors into one “bright” mode with low Q‐factor. Three transparent windows with three discrete peaks of group delay are obtained, whose bandwidth can be adjusted by changing the Q‐factor of each “dark” mode, and then the controllable group delay can be further achieved. Three samples with different distributions of group delay are fabricated and tested. Good agreement between simulated and measured results are presented. The proposed method and structures contribute to the design of passive radio frequency identification (RFID) tags, sensors, multimode filters, slow light components, and novel group‐delay modulator.

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Toroidal Metaphotonics and Metadevices

Ahmadivand

Gerislioglu

Ahuja

et al. 2020

Laser & Photonics Reviews

113

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Toroidal moments in artificial media have received growing attention and considered as a promising framework for initiating novel approaches to manage intrinsic radiative losses in nanophotonic and plasmonic systems. In the past decade, there has been substantial attention on the characteristics and excitation methods of toroidal multipoles-in particular, toroidal dipole-in 3D bulk and planar metaplatforms. The remarkable advantages of toroidal resonances have thrust the toroidal metasurface technology from relative anonymity into the limelight, in which researchers have recently centered on developing applied optical and optoelectronic subwavelength devices based on toroidal metaphotonics and metaplasmonics. In this focused contribution, the key principles of 3D and flatland toroidal metastructures are described, and the revolutionary tools that have been implemented based on this topology are briefly highlighted. Infrared photodetectors, immunobiosensors, ultraviolet beam sources, waveguides, and functional modulators are some of the fundamental and latest examples of toroidal metadevices that have been introduced and studied experimentally so far. The possibility of the realization of strong plexciton dynamics and pronounced vacuum Rabi oscillations in toroidal plasmonic metasurfaces are also presented in this review. Ultimate efficient extreme-subwavelength scale devices, such as low-threshold lasers and ultrafast switches, are thus in prospect.

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An EIT-Based Compact Microwave Sensor With Double Sensing Functions

Cited by 29 publications

References 19 publications

Numerical investigation of nematic liquid crystals in the THz band based on EIT sensor

Numerical investigation of nematic liquid crystals in the THz band based on EIT sensor

Group delay modulation based on multimode electromagnetically induced transparency

Toroidal Metaphotonics and Metadevices

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