Scientists have developed an array of ultra-high sensitivity optical ultrasonic sensors

Recently, a research team led by Professor Li Zhaohui and Associate Professor Shen Lecheng of the School of Electronics and Information Engineering (School of Microelectronics) of Sun Yat-sen University successfully developed an ultra-high sensitivity optical ultrasonic sensor array containing 15 microcavities based on the sulfur-based micro-nano processing platform, and integrated the new communication algorithm digital optical frequency comb technology to carry out parallel signal demodulation and photoacoustic computational imaging related research based on the structure of the chalcogenitho-chip array device. Related research papers were published inNature Communications

Schematic diagram of photoacoustic imaging based on chalcogenide microring sensor array and digital optical frequency comb demodulation technology. Photo courtesy of the research team

In recent years, the Li Zhaohui/Shen Lecheng team has been committed to building a preparation platform for chalcogenide micro-nano devices, and carrying out multiphysics sensing and imaging application research accordingly.

In terms of algorithm research, they proposed digital optical frequency comb technology based on advanced optical information processing algorithms, which has the advantages of high efficiency, large bandwidth and multi-dimensional demodulation, and combines optical microcavity to realize ultrasonic signal demodulation in dual resonance mode. In terms of technological innovation, a non-suspended sulfur acousto-optic modulator with high modulation efficiency has been developed; In terms of imaging application and regulation, high-throughput holographic imaging and high-speed light field regulation for biomedical treatment are carried out. These research results show that the combination of advanced optical information processing technology and new chalcogenide material devices has great potential and prospect in biological imaging and medical sensing.

Based on the above accumulation, the team recently developed an ultra-high sensitivity optical ultrasonic sensor array containing 15 microcavities. This microring sensor array has the advantages of high sensitivity, large bandwidth, and small size, and a single microring sensor has a detection bandwidth of 175 MHz (-6 dB) and a noise-equivalent pressure of 2.2 mPaHz?1/2. Based on the tunable digital optical frequency comb technology, the research team also developed a set of high-performance parallel signal detection scheme that can be matched with the microring sensor array, and demonstrated the photoacoustic computational imaging results for high-speed dynamic particles, static leaf veins and live zebrafish.

The above research work was supported by the Key Research and Development Program of the Ministry of Science and Technology, the National Natural Science Foundation of China, and the Guangdong Laboratory of Southern Marine Science and Engineering (Zhuhai). (Source: China Science News Zhu Hanbin)

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