Refractive Index Sensing Based on Terahertz Spoof Surface Plasmon Polariton Structure

Chen, Xinda; Xiao, Huaibao; Lu, Guizhen; Zhao, Ruiqi

doi:10.1088/1742-6596/1617/1/012008

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…For In order to show the performance of the proposed MMGS sensor compared to the conventional CBGS model, the electromagnetic elds con ned in the surface of the sensors are calculated using equations (8), (9). The geometrical dimensions of unit-cell are presented in Figure . 1 and Table 1.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…Terahertz radiation has recently become the focus of researchers thanks to its special properties [1][2][3][4][5][6][7][8][9][10][11] . The considerable energy transmitted by photons in the infrared, visible and ultraviolet frequency ranges can damage biological cells and pose a risk to highly ammable sample materials.…”

Section: Introductionmentioning

confidence: 99%

“…The theoretical and simulated results show that the higher mode can provide more sensitivity for the refractive index of the sample material, and have a larger detection range. The use of creative and new unit cells, such as the stepped structure 9 , the structure based on graphene 12,14,33 , and the Pyramidal Corrugations 7 have also been presented in many references, each of them has been able to improve the sensing level in these types of structures. The vast majority of them have investigated the accuracy of these changes by comparing the resonance positions of the dispersion curve obtained by CST Studio and the re ection spectrum calculated by COMSOL software, although a limited number have also used semi-analytical methods like rigorous coupled-wave analysis (RCWA) to increase the speed of analysis and validation of the structure 34,35 .…”

Section: Introductionmentioning

confidence: 99%

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Terahertz Spoof Surface Plasmon Polariton Structure for High-precision Gas Sensor Technology

NAJAFY,

ABBASI-ARAND,

HESARI-SHERMEH

2024

Preprint

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In the realm of sensor technology, it is a significant challenge to accurately identify and differentiate sample materials in the gas phase, especially when they have closely similar refractive indices. A promising solution in the THz range is the use of plasmonic spoof surface structures configured in an Otto arrangement. This configuration increases sensitivity by amplifying the trapped fields within the periodic structure and the sample material. This represents a remarkable improvement over the conventional binary-grating structure (CBGS) model with the proposed multilevel meta-grating structure (MMGS) sensor. An in-depth analysis of gas samples shows a remarkable increase in sensitivity to a small refractive index change up to by 11.4 (TH/RIU). The refractive index of gas sample is more sensitive to both pressure and molecular density. The proposed setup has been meticulously designed to maximize reflectance within the sensor's reflectance spectrum. This has been achieved by precisely adjusting the air gap distance, effectively minimizing the impact of sample material density. The new proposed design proves to be particularly suitable for effectively detecting different gas with closely spaced refractive indices. An investigation of four common and well-known gas shows a minimum resolution of 5 GHz for resonance peak positions. The results are validated by simulating the reflection spectrum using the semi analytical rigorous coupled wave analysis (RCWA) method. Moreover, the eigenmode solver in the CST-Studio software is used to generate dispersion curves. The proposed structure is very useful for high precision sensors with a small refractive index change.

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Section: Simulation Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Terahertz Spoof Surface Plasmon Polariton Structure for High-precision Gas Sensor Technology

NAJAFY,

ABBASI-ARAND,

HESARI-SHERMEH

2024

Preprint

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show abstract

“…It is noted that the terahertz sensing based on SSPPs of PGMS has been well discussed in the published literatures [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. For example, Ng et al experimentally analyzed the relationship between spectral shift of SSPPs excitation on PGMS and refractive index filling in 1D periodic grooves [22,23].…”

Section: Introductionmentioning

confidence: 99%

Resolved terahertz spectroscopy of tiny molecules employing tunable spoof plasmons in an otto prism configuration

Yao¹,

Zhang²,

Liu³

et al. 2022

J. Opt.

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Sensitive detection of terahertz fingerprint absorption spectrum for tiny molecules is essential for bioanalysis. However, it is extremely challenging for traditional terahertz spectroscopy measurement because of the weak spectral response caused by the large mismatch between terahertz wavelengths and biomolecular dimensions. Here, we proposed a wideband-tunable metal plasmonic terahertz biosensor to detect tiny biomolecules, employing attenuated total reflection in an Otto prism configuration and tightly confined spoof surface plasmons on the grooved metal surface. Benefitting from the plasmonic electric field enhancement, such a biosensor is able to identify the molecular terahertz fingerprints. As a proof of concept, a hypothetical molecule modeled by the Lorentz model with two vibrational modes is used as the sensing analytes. Simulation results show that the absorption of two vibrational modes of analytes can be selectively enhanced up to ten times by plasmonic resonance, and their fingerprints can be resolved by sweeping incident angle in a wide waveband. Our work provides an effective approach for the highly sensitive identification of molecular fingerprints in fields of biochemical sensing for tiny analytes.

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“…Another type of the sensor design based on subwavelength gratings and Otto prism coupler was proposed by Ng et al [ 13 ]. Such sensors were developed in the works of other authors [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ], who obtained the maximum sensitivity to be as high as 3.57 THz/RIU. The corresponding figure of merit (FOM) is 3966 [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Optimization of Refractive Index Sensors Based on Diffraction Gratings with High Aspect Ratio in Terahertz Range

Kameshkov

Gerasimov

Knyazev

2021

Sensors

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Terahertz surface plasmon resonance (SPR) sensors have been regarded as a promising technology in biomedicine due to their real-time, label-free, and ultrasensitive monitoring features. Different authors have suggested a lot of SPR sensors, including those based on 2D and 3D metamaterials, subwavelength gratings, graphene, and graphene nanotube, as well as others. However, one of the traditional approaches to realize high sensitivity SPR sensors based on metal diffraction gratings has been studied poorly in the terahertz frequency range. In this article, a linear metal rectangular diffraction grating with high aspect ratio is studied. The influence of the grating structure parameters on the sensor sensitivity is simulated. Effects arising from different ratios of depth and width were discovered and explained. The results show that the sensitivity can be increased to 2.26 THz/RIU when the refractive index range of the gas to measure is between 1 and 1.002 with the resolution 5×10−5 RIU.

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Refractive Index Sensing Based on Terahertz Spoof Surface Plasmon Polariton Structure

Cited by 8 publications

References 7 publications

Terahertz Spoof Surface Plasmon Polariton Structure for High-precision Gas Sensor Technology

Terahertz Spoof Surface Plasmon Polariton Structure for High-precision Gas Sensor Technology

Resolved terahertz spectroscopy of tiny molecules employing tunable spoof plasmons in an otto prism configuration

Numerical Optimization of Refractive Index Sensors Based on Diffraction Gratings with High Aspect Ratio in Terahertz Range

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