Analysis of highly directive photoconductive dipole antenna at terahertz frequency for sensing and imaging applications

Malhotra, Isha; Jha, Kumud Ranjan; Singh, Ghanshyam

doi:10.1016/j.optcom.2017.04.008

Cited by 32 publications

(5 citation statements)

References 46 publications

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“…Recently, inspection of historical paintings using THz was demonstrated . High resolution terahertz imaging systems have been demonstrated recently using aspherical lens and solid immersion techniques . In the present work, the GaN HEMT transistor was used as a single‐pixel sensor in the 0.3 THz imaging system shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…[37,38] High resolution terahertz imaging systems have been demonstrated recently using aspherical lens [39] and solid immersion techniques. [40] In the present work, the GaN HEMT transistor was used as a single-pixel sensor in the 0.3 THz imaging system shown in Figure 3. Two objects (a key and a cutter blade (Figure 9(b)) were hidden inside an envelope (Figure 9(a)) and placed on an automated XY stage.…”

Section: Terahertz Imaging Of Hidden Objectsmentioning

confidence: 99%

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Continuous Wave Terahertz Sensing Using GaN HEMTs

Javadi

Delgado-Notario

Masoumi

et al. 2018

Physica Status Solidi (a)

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A commercial GaN high electron mobility transistor (HEMT) is investigated as efficient detector of terahertz radiations. Enhancement of the photoresponse in excess of one order of magnitude (up to 1 kV W−1) is obtained when a constant drain‐to‐source current is applied. The photoresponse remains unchanged with chopping frequency up to 5 kHz demonstrating a high‐speed response of GaN HEMT detectors. It is demonstrated that the bounding wires play an important role to couple terahertz radiations to the channel of the device. Terahertz imaging of hidden objects by using GaN HEMTs as a sensor is also demonstrated.

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Section: Resultsmentioning

confidence: 99%

Section: Terahertz Imaging Of Hidden Objectsmentioning

confidence: 99%

Continuous Wave Terahertz Sensing Using GaN HEMTs

Javadi

Delgado-Notario

Masoumi

et al. 2018

Physica Status Solidi (a)

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“…Recently, Malhotra et al . [140] have analyzed three designs of small gap PCAs as emitter's, to enhance the directivity and radiation efficiency which has the major limitation of significantly low directivity. A synthesis technique is presented to determine the antenna parameters corresponding to 1.5 THz to detect the powdered hidden explosives such as RDX, HMX, and PETN.…”

Section: Thz Antennasmentioning

confidence: 99%

“…On the transmitter International Journal of Microwave and Wireless Technologies side, the PCA is biased with a fixed external voltage and the optical source however on the receiver side no biased voltage is required. Recently, Malhotra et al [140] have analyzed three designs of small gap PCAs as emitter's, to enhance the directivity and radiation efficiency which has the major limitation of significantly low directivity. A synthesis technique is presented to determine the antenna parameters corresponding to 1.5 THz to detect the powdered hidden explosives such as RDX, HMX, and PETN.…”

mentioning

confidence: 99%

Terahertz antenna technology for imaging applications: a technical review

Malhotra

Jha

Singh

2018

Int. J. Microw. Wireless Technol.

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The terahertz (THz) regime of the electromagnetic spectrum is rich with the emerging possibilities in imaging applications with unique characteristics to screening for weapons, explosives and bio-hazards, imaging of concealed objects, water content, and skin, and these advantages can be harnessed by using the effective THz sources and detectors. In THz imaging systems, the pulsed THz sources and detectors find unique applications and thus we have emphasized on re-visiting these kinds of systems. Several novel imaging techniques which exploit the distinctive properties of the THz systems have been presented. Moreover, the THz antenna is one of the most important components of a THz imaging system as it plays a significant role in both impedance matching and power source. Therefore, the recent developments in THz antenna design for imaging applications are reviewed and the potential challenges of such THz systems are investigated. The photoconductive antennas form the basis of many THz imaging and spectroscopy systems and finds promising applications in various scientific fields. However, for the imaging applications, there is a requirement of planar and compact THz antenna sources with on-chip fabrication and high directivity in order to achieve large depth-of-field for better image resolution. Therefore, the key modalities of improving photoconductive dipole antennas performance are identified for imaging applications. Also, the ways to improve the directivity of the photoconductive dipole antenna are discussed. The main purpose of this review is to provide an assortment of all relevant literature to bring researchers up-to-date on the current state-of-the-art and potential challenges of THz antenna technology for imaging applications.

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“…Terahertz (THz) waves (0.1–10 THz) have various features, such as producing low power levels [ 10 ], being nonionizing [ 11 ], offering good penetration capabilities and resolution [ 12 ], and having sensitivity to water molecules [ 13 ]. Based on these unique features, THz radiation has potential applications in biology [ 14 ], security [ 15 ], data communication [ 16 ], biomedical imaging [ 17 , 18 ], and food and agriculture [ 19 ]. Over the past two decades, THz imaging and spectroscopy have been investigated for biomedical applications [ 20 , 21 ], including diagnosis of liver cirrhosis [ 22 ], burn wounds [ 23 ], breast cancer [ 24 ], colon tumor [ 25 ], brain tumor [ 26 ], skin cancer [ 27 ], and other diseases [ 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Terahertz Imaging for Breast Cancer Detection

Wang

2021

Sensors

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Terahertz (THz) imaging has the potential to detect breast tumors during breast-conserving surgery accurately. Over the past decade, many research groups have extensively studied THz imaging and spectroscopy techniques for identifying breast tumors. This manuscript presents the recent development of THz imaging techniques for breast cancer detection. The dielectric properties of breast tissues in the THz range, THz imaging and spectroscopy systems, THz radiation sources, and THz breast imaging studies are discussed. In addition, numerous chemometrics methods applied to improve THz image resolution and data collection processing are summarized. Finally, challenges and future research directions of THz breast imaging are presented.

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Analysis of highly directive photoconductive dipole antenna at terahertz frequency for sensing and imaging applications

Cited by 32 publications

References 46 publications

Continuous Wave Terahertz Sensing Using GaN HEMTs

Continuous Wave Terahertz Sensing Using GaN HEMTs

Terahertz antenna technology for imaging applications: a technical review

Terahertz Imaging for Breast Cancer Detection

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