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High‐resolution photoacoustic thermal‐wave microscopy
1.The thermal “wave” is the solution to the periodic thermal diffusion equation, and has the characteristics of a highly damped wave. The “wavelength” used here is the reduced wavelength and equals the thermal diffusion length.
2.A. Rosencwaig, J. Appl. Phys. (to be published).
3.Y. H. Wong, R. L. Thomas, and J. J. Pouch, Appl. Phys. Lett. 35, 368 (1979).
4.G. Busse and A. Rosencwaig, Appl. Phys. Lett. 36, 815 (1980).
5.R. L. Thomas, J. J. Pouch, Y. H. Wong, L. D. Favro, P. K. Kuo, and A. Rosencwaig, J. Appl. Phys. 51, 1152 (1980).
6.The photoacoustic microscope experiment at 840 MHz reported by H. K. Wickramasinghe, R. C. Bray, V. Jipson, C. F. Quate, and J. R. Salcedo [Appl. Phys. Lett. 33, 923 (1978)] is, as explained in Ref. 2, primarily an ultrasonic imaging experiment since the thermal waves generated at 840 MHz do not have a sufficient penetration depth to image the subsurface pattern in the sample.
7.M. Luukkala and A. Penttinen, Electron. Lett. 15, 326 (1979).
8.A. Rosencwaig, Am. Lab. 11, 39 (1979).
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