Terahertz Spectroscopy - A Cutting Edge Technology

Huang, Yen-Yu; Chen, Hsin‐Lung; Hashimoto, Takeji

doi:10.5772/62805

Cited by 16 publications

(4 citation statements)

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“…A polarization-insensitive THz metamaterial absorber (MMA) made of dielectric-metal disc antennas has been used to theoretically and experimentally examine residual herbicides and pesticides Figure shows the terahertz radiation applications, and the findings demonstrate that THz MMA significantly increases sensitivity, with a limit of detection (LOD) of certain herbicides and pesticides reaching 5 ppm . These findings suggest that the THz MMA platform could be a useful tool for highly sensitive THz applications in the regulation of food quality and safety and has the potential to be used to detect pesticide and herbicide residues in agricultural and food goods …”

Section: Representative Image Sensing Devices and Their Actual Applic...mentioning

confidence: 99%

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Technological Evolution of Image Sensing Designed by Nanostructured Materials

Iqbal

Malik

et al. 2023

ACS Materials Lett.

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Imaging sensing holds a remarkable place in modern electronics and optoelectronics for the complementary metal-oxide-semiconductor integration of highspeed optical communications and photodetection with the merits of high-speed operation, cost-effectiveness, and noncomplex fabrication. The optimum quality of image sensing relies on noise, sensitivity, power consumption, voltage operation, and speed imaging to access and compete with the state-of-the-art image sensing devices in the industry. Many studies have been conducted to address these issues; however, performance has not yet been optimized and solutions are still in the works. In this review, we briefly provide information on recent advances in image sensing using nanostructured emerging materials through nanofabrication integration including the technology evolution on traditional and modern technology platforms, general mechanisms, classification, and actual applications as well as existing limitations. Finally, new challenges and perspectives for the future trends of image sensing and their possible solutions are also discussed.

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Section: Representative Image Sensing Devices and Their Actual Applic...mentioning

confidence: 99%

“…Application of terahertz radiation for detection of flaws in photovoltaic materials, medical imaging, screening, pharmaceuticals, quality control, dentistry, communication, and astronomy. Reproduced with permission from ref . Copyright 2017 IntechOpen, UK.…”

Section: Representative Image Sensing Devices and Their Actual Applic...mentioning

confidence: 99%

Technological Evolution of Image Sensing Designed by Nanostructured Materials

Iqbal

Malik

et al. 2023

ACS Materials Lett.

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“…The terahertz (THz) frequency range (0.1-10 THz), lying between high frequency electronics on the one side and infrared optics on the other [1], is of broad prospects in various fields of science such as the spectroscopy, biology, medicine, imaging, astronomy, security and communications [2].…”

Section: Introductionmentioning

confidence: 99%

Inversionless terahertz lasing in a four-level Raman-type scheme within mid-infrared quantum cascade structures

et al. 2023

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This paper applies the density matrix formalism to investigate a feasibility of inversionless terahertz (THz) lasing within a mid-infrared (mid-IR) quantum cascade laser (QCL). The proposed structure aims to use a mid-IR QCL as an efficient pump source that integrated with a four-level Raman-type scheme to generate THz radiation through strong coherence excited in the system. A key aspect of the design is that the THz generation is achieved by interplay between inversion-based lasing and coherent effects due to quantum interference between the microscopic polarizations of the dipole-allowed transitions in the four-level system. THz intensity gain arising from both the inversion-based lasing and coherent effects is derived from the off-diagonal density matrix elements in the four-level system. The simulation results indicate that the proposed design demonstrates the potential to achieve THz lasing with good temperature characteristics and without the need for population inversion.

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“…Terahertz (THz) radiation covers a very narrow regime from 0.1 to 10 THz in the electromagnetic spectrum [1,2]. The region is known as the THz gap because of the lack of active and passive devices as well as components [3][4][5], unlike microwave technology.…”

Section: Introductionmentioning

confidence: 99%

Thin film sensing in a planar terahertz meta-waveguide

Islam¹,

Bhowmik²,

Dhriti³

et al. 2022

J. Opt.

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In this paper, we explore sensing characteristics of a terahertz meta-waveguide consisting of a one-dimensional array of periodically arranged subwavelength scale split-ring resonators (SRRs). The substrate of the meta-waveguide structure has two layers. The lower one is made of metal, whereas the upper layer is made of a dielectric. On the top of it, metallic SRRs are placed. The meta-waveguide is capable of guiding the fundamental as well as higher-order terahertz modes along the designed structures. We analyze the sensing capability of the meta-waveguide by covering it with the thin ﬁlm analyte. The waveguide transmission properties are observed for varying refractive index of the analyte. Diﬀerent sensing parameters such as frequency shift, sensitivity, ﬁgure of merit (FoM) of resonance modes supported by the meta-waveguide have been studied. The obtained values of sensitivity and FoM indicates better sensing capability of the meta-waveguide rather than meta-designs in the transmission approach. We also employ coupled harmonic oscillator model in order to interpret and validate the numerical observations. The meta-waveguide designs can open alternate avenues for sensing thin ﬁlm analytes with greater sensitivity.

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Terahertz Spectroscopy - A Cutting Edge Technology

Cited by 16 publications

References 0 publications

Technological Evolution of Image Sensing Designed by Nanostructured Materials

Technological Evolution of Image Sensing Designed by Nanostructured Materials

Inversionless terahertz lasing in a four-level Raman-type scheme within mid-infrared quantum cascade structures

Thin film sensing in a planar terahertz meta-waveguide

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