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Our T-ray Research Projects
Terahertz near-field imaging
The resolution of any imaging system in the far field is limited by the fundamental diffraction, which preclude observing feature sizes smaller than about a wavelength. The group has implemented a near-field approach for terahertz waves. The system can resolve feature sizes to sub-wavelength scales.
Terahertz waves will become an enabling technology for short-range wireless communications. However, materials with properties suitable for manipulating terahertz waves are naturally limited. Terahertz metamaterials, another key research area of the group, will fulfill the demands in this direction. The activities include beam steering, modulation, sensing, etc.
Terahertz system characterisation
The research area is relatively new, as is the techniques for generating and detecting terahertz waves. The signal-to-noise ratio and the dynamic range of the systems are typically limited. This necessitates thorough system characterisation, one main research area of the group, to determine optimal conditions of measurement.
Terahertz material characterisation
Material properties at terahertz frequencies become relevant for cutting-edge wireless communications and high-speed integrated circuits. The group has capabilities of characterising a broad range of materials, in the transmission and reflection modes.
Terahertz waves can penetrate optically opaque objects such as polymers and papers. Hence the waves can be exploited for non-destructive evaluation. The group has capabilities in non-destructive evaluation, and has collaborated with several groups in other institutes focusing on material science.
Many organic molecules show fingerprint absorption at terahertz frequencies. Hence the waves are useful in medical diagnosis and security screening. The group has extensive research activities falling in this category.