WANG Fei,GUO Dong-mei,XIE Yu-xing,ZHANG Liang,PEI Wei-hua,CHEN Hong-da.An implantable optrode composed of fiber and flexible thin-film electrode[J].Optoelectronics Letters,2018,14(4):271-275
An implantable optrode composed of fiber and flexible thin-film electrode
Author NameAffiliation
WANG Fei State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
University of Chinese Academy of Sciences, Beijing 100049, China
CAS Center for Excellence in Brain Science and Intelligence Technology, Shanghai 200000, China 
GUO Dong-mei Hebei Vocational College of Rail Transportation, Shijiazhuang 050000, China 
XIE Yu-xing State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
University of Chinese Academy of Sciences, Beijing 100049, China
CAS Center for Excellence in Brain Science and Intelligence Technology, Shanghai 200000, China 
ZHANG Liang State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China 
PEI Wei-hua State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
University of Chinese Academy of Sciences, Beijing 100049, China
CAS Center for Excellence in Brain Science and Intelligence Technology, Shanghai 200000, China 
CHEN Hong-da State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
University of Chinese Academy of Sciences, Beijing 100049, China 
Abstract:
      An implantable optrode composed of fiber and multi-channel flexible thin-film electrode is developed. The flexible recording electrode is made from polyimide and is wrapped around the optical fiber. The front end of the fiber is tapered by wet etching. With the tapered shape, the light can leak from the sidewall of the fiber, and the tapered tip makes it easy to be implanted. The flexible electrode is attached with its recording sites aligning to the tapered part on the fiber. With this method, the fiber acts as an optical waveguide, as well as a support probe for flexible thin-film electrode. This novel device simplifies the fabrication process and decreases the size of the optrode. The device works well in vivo and the optical caused spike can be recorded with signal-to-noise ratio of 6:1.
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