Theoretical analysis of a novel ultrasound generator on an optical fiber tip

Nan Wu; Wenhui Wang; Ye Tian; Charles Guthy; Xingwei Wang

doi:10.1117/12.852210

20 April 2010 Theoretical analysis of a novel ultrasound generator on an optical fiber tip

Nan Wu, Wenhui Wang, Ye Tian, Charles Guthy, Xingwei Wang

Proceedings Volume 7677, Fiber Optic Sensors and Applications VII; 76770X (2010) https://doi.org/10.1117/12.852210
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

Abstract

A novel ultrasound generator consisting of a single mode optical fiber with a layer of gold nanoparticles on its tip has been designed. The generator utilizes the optical and photo-acoustic properties of gold nanoparticles. When heated by laser pulses, a thin absorption layer made up of these nanoparticles at the cleaved surface of a single mode fiber generates a mechanical shock wave caused by thermal expansion. Mie's theory was applied in a MATLAB simulation to determine the relationship between the absorption efficiency and the optical resonance wavelengths of a layer of gold nanospheres. Results showed that the absorption efficiency and related resonance wavelengths of gold nanospheres varied based on the size of the gold nanosphere particles. In order to obtain the bandwidths associated with ultrasound, another MATLAB simulation was run to study the relationship between the power of the laser being used, the size of the gold nanosphere, and the energy decay time. The results of this and the previous simulation showed that the energy decay time is picoseconds in length.

Citation Download Citation

Nan Wu, Wenhui Wang, Ye Tian, Charles Guthy, and Xingwei Wang "Theoretical analysis of a novel ultrasound generator on an optical fiber tip", Proc. SPIE 7677, Fiber Optic Sensors and Applications VII, 76770X (20 April 2010); https://doi.org/10.1117/12.852210

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