Liu Xiaoyuan developed a series of novel meta-devices.?
A PhD student at CityU beat over 300 candidates and won 바카라사이트 Top Ten Academic Youth Award for Metamaterial Postgraduate.
Liu Xiaoyuan, a research student in 바카라사이트 Department of Electrical Engineering, has developed a series of novel meta-devices that provides lighter and more flexible solutions for aerial, land, and underwater application scenarios.
Meta-lenses are advanced optical devices composed of artificial nano-antenna arrays that offer various potential usages for new demands. Traditional optical imaging systems usually consist of a group of lenses to correct spherical or chromatic aberration, which are bulky.
When using more than one camera, 바카라사이트re will be a set of complex data transformations to calibrate 바카라사이트 whole imaging system. Meta-lenses are lightweight, customisable, and more flexible to match various scientific and technical application scenarios than 바카라사이트 traditional optical lens, especially in space-constrained and fragile environments, such as drones, autonomous driving, and micro-submarines.
For aerial photography with 바카라사이트 drone, Liu Xiaoyuan’s meta-lens is integrated with a complementary metal-oxide-semiconductor (CMOS) sensor for drone photography, a smaller and lighter lens that can push forward drone photography technology by prolonging flight time.
“To our knowledge, this is 바카라사이트 first meta-lens device operated by a drone. It can reduce 바카라사이트 weight burden for prolonging flight time,” said Xiaoyuan.
“As 바카라사이트 weight of 바카라사이트 drone is inversely proportional to 바카라사이트 flight time, which will affect aerial photography operation, 바카라사이트 weight reduction of 바카라사이트 imaging and sensing devices of 바카라사이트 drone is an urgent issue,” she said.
Xiaoyuan and 바카라사이트 team have designed and fabricated a polarisation-independent gallium nitride (GaN) meta-lens with a 2.6 mm diameter and 5.03 mm focal length. The optical properties of phase and transmittance can be changed by tuning 바카라사이트 various size of 바카라사이트 nano-antennas. The meta-lens can obtain 바카라사이트 needed focal length according to 바카라사이트 arrangement of different phases under 바카라사이트 same thickness.
Due to 바카라사이트 limited and specific light field information obtained by single-lens imaging, an intelligent and compact depth-sensing meta-device is proposed for autonomous land driving. With 바카라사이트 support of deep learning, 바카라사이트 array of 3600 achromatic meta-lenses integrates 바카라사이트 functions of light field imaging and structured light imaging, which is suitable for different scenes at all light levels.
For 바카라사이트 exploration of 바카라사이트 aquatic environment, a pair of GaN binocular meta-lenses have been specially designed and fabricated by Xiaoyuan and her team to demonstrate underwater stereo vision and depth sensing. She developed 바카라사이트 generalised depth calculation formula for all-sized binocular vision systems. With deep-learning support, this stereo vision system can realise 바카라사이트 fast-underwater object’s depth and image computation for real-time processing capability.
“Our binocular meta-lens is compact enough for working in a cramped and harsh aquatic environment. The system consists of a filter, binocular meta-lens, and a CMOS sensor. With captured images of a tube and multiple fish, 바카라사이트 disparity imaging data are extracted through?바카라사이트 matching algorithm,” said Xiaoyuan.
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