Hybrid resonant cavities: A route towards phase engineered THz metasurfaces

Kaur, Sukhvinder; Karmakar, Subhajit; Jana, Arun; Rane, Shreeya; Varshney, Ravendra K.; Chowdhury, Dibakar Roy

doi:10.1016/j.isci.2022.104024

Cited by 11 publications

(5 citation statements)

References 46 publications

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“…In addition, our study revealed multiple significant technological advancements that have impacted the THz sensing route. Among them are the shrinking of THz components, resulting in more accessible and cost-effective sensing tools, and the enhancement of Kalman Filtering algorithms, which have greatly improved noise control and signal processing capabilities [99][100][101][102][103][104][105][106][107]. Furthermore, the combination of artificial intelligence (AI) and machine learning (ML) techniques has transformed the procedure, enhancing data analysis and interpretation for more precise and practical insights [108][109][110][111][112][113][114][115][116][117][118][119][120][121].…”

Section: Resultsmentioning

confidence: 99%

Terahertz sensing through the lens of the Kalman filter: a bibliometric exploration

Obaideen,

AlShabi,

Bonny

2024

Sensing for Agriculture and Food Quality and Safety XVI

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The Terahertz (THz) spectrum, situated between microwave and infrared frequencies, is utilized for applications such as imaging and chemical analysis. This project aims to combine THz sensing with the Kalman Filter estimator, a recursive algorithm typically utilized for estimating data with high levels of noise. Upon a thorough effort, we investigate the prospects and challenges in THz sensing using the Kalman filter for assistance. Upon examining this area, we found an increasing pattern in combining THz wavelength technologies that boosts the precision and effectiveness of Kalman Filter applications in THz sensing. The topic being talked about is the significance of this technology in improving the dependability of detecting and measuring data in difficult conditions. Moreover, this document outlines essential advancements and trends in the field of THz sensing, as well as the progress in various disciplines that contribute to the development of THz sensing. This paper presents details about the current planning and disadvantages of utilizing Kalman Filters in THz sensing. It has served as a broad guide for both scientists and professionals, laying the groundwork for future advancements in this field. Incorporating these directivity methods not only enhances detection capabilities but also produces novel contributions to the field of THz sensing that also facilitate knowledge sharing.

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Section: Resultsmentioning

confidence: 99%

Terahertz sensing through the lens of the Kalman filter: a bibliometric exploration

Obaideen,

AlShabi,

Bonny

2024

Sensing for Agriculture and Food Quality and Safety XVI

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“…To verify the aforementioned designed functions, the full-wave simulations are conducted by using a finite-difference time-domain (FDTD) solver in commercially available numerical software, CST microwave studio [27,28]. In the simulations, moreover, a tetrahedral mesh with the adaptive mesh scheme is utilized to optimize the numerical simulation accuracy, in which the moderate mesh accuracy is adopted to make good tradeoff between accuracy, memory requirements and simulation time.…”

Section: Design and Simulation Of Metasurface Unit Cellsmentioning

confidence: 99%

Full-Space Wavefront Shaping of Broadband Vortex Beam with Switchable Terahertz Metasurface Based on Vanadium Dioxide

Li,

Zhang,

Jiang

et al. 2023

Nanomaterials

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Currently, vortex beams are extensively utilized in the information transmission and storage of communication systems due to their additional degree of freedom. However, traditional terahertz metasurfaces only focus on the generation of narrowband vortex beams in reflection or transmission mode, which is unbeneficial for practical applications. Here, we propose and design terahertz metasurface unit cells composed of anisotropic Z-shaped metal structures, two dielectric layers, and a VO2 film layer. By utilizing the Pancharatnam–Berry phase theory, independent control of a full 2π phase over a wide frequency range can be achieved by rotating the unit cell. Moreover, the full-space mode (transmission and reflection) can also be implemented by utilizing the phase transition of VO2 film. Based on the convolution operation, three different terahertz metasurfaces are created to generate vortex beams with different wavefronts in full-space, such as deflected vortex beams, focused vortex beams, and non-diffraction vortex beams. Additionally, the divergences of these vortex beams are also analyzed. Therefore, our designed metasurfaces are capable of efficiently shaping the wavefronts of broadband vortex beams in full-space, making them promising applications for long-distance transmission, high integration, and large capacity in 6G terahertz communications.

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“…This change can be detected by changes in the EOT or SPR signals, allowing the analyte to be detected with higher sensitivity 35 , 36 . In addition, dipole cavities have been thoroughly studied for their optical and electromagnetic properties, including in the terahertz (THz) frequency ranging between 0.1 and 10 THz (or wavelengths between 30 to 3,000 µm) 37 , 38 . The modulation of SPPs at THz has been shown using several THz sub-wavelength plasmonic structures.…”

Section: Introductionmentioning

confidence: 99%

Terahertz sensing of reduced graphene oxide nanosheets using sub-wavelength dipole cavities

Sajeev,

Rane,

Ghosh

et al. 2023

Sci Rep

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Because of extraordinary optoelectronic properties, two-dimensional (2D) materials are the subject of intense study in recent times. Hence, we investigate sub-wavelength dipole cavities (hole array) as a sensing platform for the detection of 2D reduced graphene oxide (r-GO) using terahertz time-domain spectroscopy (THz-TDS). The r-GO is obtained by reducing graphene oxide (GO) via Hummer's method. Its structural characteristics are verified using X-ray diffraction (XRD) and Raman spectroscopy. We also assessed the morphology and chemistry of r-GO nanosheets by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDAX), and Fourier Transformed Infrared (FTIR) spectroscopy. Further, we studied the surface plasmon resonance (SPR) characteristics of r-GO nanosheets hybridized dipole cavities using THz-TDS by varying the r-GO thickness on top of the dipole cavities, since these cavities are well known for sustaining strong SPRs. Based on these, we experimentally obtained a sensitivity of 12 GHz/µm for the porous r-GO film. Thus, a modification in SPR characteristics can be employed towards the identification and quantification of r-GO by suitably embedding it on an array of dipole cavities. Moreover, we have adopted a generic approach that can be expanded to sense other 2D materials like Boron Nitride (BN), phosphorene, MoS2, etc., leading to the development of novel THz nanophotonic sensing devices.

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Hybrid resonant cavities: A route towards phase engineered THz metasurfaces

Cited by 11 publications

References 46 publications

Terahertz sensing through the lens of the Kalman filter: a bibliometric exploration

Terahertz sensing through the lens of the Kalman filter: a bibliometric exploration

Full-Space Wavefront Shaping of Broadband Vortex Beam with Switchable Terahertz Metasurface Based on Vanadium Dioxide

Terahertz sensing of reduced graphene oxide nanosheets using sub-wavelength dipole cavities

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