Journal
APPLIED PHYSICS EXPRESS
Volume 9, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.7567/APEX.9.066701
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Funding
- National Basic Research Program of China [2012CB921504]
- National Natural Science Foundation of China (NSFC) [51239005]
- NSFC [11404147, 11174142]
- Jiangsu Provincial NSF [BK20140519]
- China Postdoctoral Science Foundation [2015M571672]
- Research Fund for Advanced Talents of Jiangsu University [11JDG118]
- Training Project of Young Backbone Teachers of Jiangsu University
- Jiangsu University [201610299080X]
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We report on a broadband acoustic focusing lens comprising 20 heat sources of different temperatures, 10 on each side of the array, in air. This focusing phenomenon is attributed to temperature gradients inducing the desired refractive index in one medium (air) and to the continuously changing acoustic impedance, which avoids any acoustic impedance difference that would occur between a lens and air. The results indicate that this focusing lens has a broader bandwidth (>3.5 kHz), higher intensity amplification (about 5.0 times), and a simpler structure. This focusing lens has great potential for applications in ultrasonic devices. (C) 2016 The Japan Society of Applied Physics
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