Ceramics International, Год журнала: 2025, Номер unknown
Опубликована: Фев. 1, 2025
Язык: Английский
Sensors, Год журнала: 2023, Номер 23(13), С. 5938 - 5938
Опубликована: Июнь 26, 2023
The doubly clamped microelectromechanical system (MEMS) beam resonators exhibit extremely high sensitivity to tiny changes in the resonance frequency owing their quality (Q-) factors, even at room temperature. Such a sensitive frequency-shift scheme is very attractive for fast and highly terahertz (THz) detection. MEMS resonator absorbs THz radiation induces temperature rise, leading shift its frequency. This proportional amount of absorbed by can be detected quantified, thereby allowing measured. In this review, we present an overview bolometer based on aspects working principle, readout, detection speed, sensitivity, attempts improving performance. allows one have comprehensive view such novel detector.
Язык: Английский
Процитировано
9
Photonics, Год журнала: 2023, Номер 10(7), С. 800 - 800
Опубликована: Июль 10, 2023
A Schottky barrier high-electron-mobility avalanche transit time (HEM-ATT) structure is proposed for terahertz (THz) wave generation. The laterally oriented and based on AlGaN/GaN two-dimensional electron gas (2-DEG). Trenches are introduced at different positions of the top AlGaN layer realizing sheet carrier density profiles 2-DEG channel; resulting devices equivalent to high–low, low–high low-high–low quasi-Read structures. DC, large-signal noise simulations HEM-ATTs were carried out using Silvaco ATLAS platform, non-sinusoidal-voltage-excited double-iterative field-maximum small-signal simulation models, respectively. breakdown voltages estimated via validated by experimental measurements; they found be around 17–18 V. Under conditions, series resistance device 20 Ω. shows that HEM-ATT source capable delivering nearly 300 mW continuous-wave peak power with 11% conversion efficiency 1.0 THz, which a significant improvement over achievable THz output from conventional vertical GaN double-drift region (DDR) IMPATT source. performance was significantly improved structures compared structure. These compatible state-of-the-art medium-scale semiconductor fabrication processes, scope further miniaturization, may have potential application in compact biomedical spectroscopy systems as solid-state sources.
Язык: Английский
Процитировано
9
IEEE Access, Год журнала: 2023, Номер 11, С. 104463 - 104484
Опубликована: Янв. 1, 2023
Several research articles are available in the literature regarding design of antennas, but hardly (to best authors' knowledge) few papers covered antennas that designed for detection, diagnostics, and monitoring various diseases. There is a need article which performance such significant should be compared highlighted based on techniques to enhance parameters include efficiency, bandwidth, size appropriate bio-compatible material used transmit data from human body efficiently. Antennas essential biomedical applications wireless communication, miniaturization, integration, implantable devices, diagnostic imaging, biotelemetry, biosensing. They enable efficient reliable connectivity, facilitating remote monitoring, improving patient care, advancing medical research. Designing presents several challenges, including miniaturization integration into compact ensuring biocompatibility with body, conforming biological structures, mitigating electromagnetic interference (EMI), accounting signal attenuation propagation optimizing power compliance regulatory standards. Overcoming these challenges requires expertise antenna design, biocompatibility, modelling, collaboration between disciplines. Therefore, detailed review required so any scholar who wishes excel this field may read understand future directions better work already done antennas. This comprises comparison diagnosis diseases, can helpful community detection skin cancer, breast lungs endoscopy, brain tumor glucose level detection. The features thoroughly investigated provide metrics diagnose advantage study understanding different types also allows realizing materials flexible effect Specific Absorption Rate (SAR) human/animal finally, tables terms gain, directivity respect type substrate each disease. These have diagnosis, early-stage cancer and, some cases providing enough energy cure cells body. Moreover, implementation Machine learning algorithms early above-mentioned diseases discussed.
Язык: Английский
Процитировано
9
Scientific Reports, Год журнала: 2025, Номер 15(1)
Опубликована: Фев. 7, 2025
Abstract Terahertz (THz) light has the unique properties of being very sensitive to water, non-ionizing, and having sub-millimeter depth resolution, making it suitable for medical imaging. Skin conditions including eczema, psoriasis skin cancer affect a high percentage population we have been developing THz probe help with their diagnosis, treatment management. Our in vivo studies using handheld probe, but this prone positional errors through sensorimotor perturbations tremors, giving spatially imprecise measurements significant variations contact pressure. As operator tires extended device use, these are further exacerbated. A robotic system is therefore needed tune critical parameters achieve accurate repeatable skin. This paper proposes an autonomous acquisition system, PicoBot, designed non-invasive diagnosis healthy diseased conditions, based on hydration levels The PicoBot can 3D scan segment out region interest skin’s surface, precisely position (± 0.5/1 mm/degrees) normal apply desired amount force 0.1N) maintain firm required 60 s during data acquisition. automation improves stability acquired signals, reducing standard deviation amplitude fluctuations by over factor four at 1 compared hand-held mode. We show results volunteers dry various parts body such as volar forearm, forehead, cheeks, hands. tests conducted validate preclinical feasibility concept along robustness advantages manual measurement setup.
Язык: Английский
Процитировано
0
Ceramics International, Год журнала: 2025, Номер unknown
Опубликована: Фев. 1, 2025
Язык: Английский
Процитировано
0