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Capacitive micromachined ultrasonic transducers (CMUTs) with isolation posts |
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| Authors: | Huang Yongli Zhuang Xuefeng Haeggstrom Edward O Ergun A Sanli Cheng Ching-Hsiang Khuri-Yakub Butrus T |
| Affiliation: | a Kolo Technologies Inc., San Jose, CA, United States b Edward L. Ginzton Laboratory, Stanford University, 450 Via Palou, Stanford, CA 94305, United States c Electronics Research Unit, University of Helsinki, Helsinki, Finland d Siemens Corporate Research, Mountain View, CA, United States e Research Institute of Innovative Products and Technologies, The Hong Kong Polytechnic University, Hong Kong, China |
| Abstract: | In this paper, an improved design of a capacitive micromachined ultrasonic transducer (CMUT) is presented. The design improvement aims to address the reliability issues of a CMUT and to extend the device operation beyond the contact (collapse) voltage. The major design novelty is the isolation posts in the vacuum cavities of the CMUT cells instead of full-coverage insulation layers in conventional CMUTs. This eliminates the contact voltage drifting due to charging caused by the insulation layer, and enables repeatable CMUT operation in the post-contact regime. Ultrasonic tests of the CMUTs with isolation posts (PostCMUTs) in air (electrical input impedance and capacitance vs. bias voltage) and immersion (transmission and reception) indicate acoustic performance similar to that obtained from conventional CMUTs while no undesired side effects of this new design is observed. |
| Keywords: | Ultrasound Transducer CMUT Isolation posts Charging Hysteresis Reliability |
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