Development of Terahertz devices, algorithms and biomedical applications

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• Qiushuo Sun (University of Birmingham)
• Wednesday 24 February 2021, 16:00-17:00
• https://bham-ac-uk.zoom.us/j/87933879601?pwd=V0ttWlJWQVIwVldrNVdJU2gwR1BBZz09.

If you have a question about this talk, please contact Dr Miguel Navarro-Cia.

Zoom Meeting ID: 879 3387 9601. Passcode: 9a976i

Terahertz (THz, 1 THz =1012 Hz) waves are electromagnetic waves in-between microwave and infrared radiation. To promote potential applications of THz technology, more advanced functional THz devices with high performance are needed, including modulators, polarizers, sensors and high-speed imaging system. This presentation summarizes recent progress in THz components built on functional materials and metamaterials. The key message is that, while the choice of materials used in such devices is important, the geometry in which they are employed also has a significant effect on the performance achieved. In particular, devices operating in total internal reflection geometry are reviewed, and it is explained how this geometry is able to be exploited to achieve a variety of THz devices with broadband operation.

As an essential processing step in many disciplines, signal denoising efficiently improves data quality without an extra cost. However, it is relatively under-utilized for THz spectroscopy. The major technique reported uses wavelet denoising in time-domain, which has a fuzzy physical meaning and limited performance on low-frequency and water-vapor regions. We report the newly developed signal processing algorithms for THz time domain spectroscopy (TDS), they enable more accurate sample characterisation by increasing the signal-to-noise ratio up to 10 dB.

THz light is non-ionizing, so it is suitable for not only tissue imaging but also non-invasive human skin examination and diagnosis. We use in-vivo THz imaging to monitor how silicone gel sheeting affects the THz response of human skin during occlusion and the associated THz reflectivity and refractive index changes are presented. THz imaging is also utilized to compare the efficacy of different transdermal drug delivery methods including topical application and via a needle patch. Our work shows the feasibility and potential of using THz imaging to quantify and evaluate different transdermal application methods.

This talk is part of the Metamaterials and Nanophotonics Group Seminars series.

This talk is included in these lists:

• Bham Talks
• Metamaterials and Nanophotonics Group Seminars
• What's on in Physics?
• https://bham-ac-uk.zoom.us/j/87933879601?pwd=V0ttWlJWQVIwVldrNVdJU2gwR1BBZz09

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