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13 May 2002

Volume 80, Issue 19, pp. 3467-3650

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A class of boron-rich solid-state neutron detectors

B. W. Robertson, S. Adenwalla, A. Harken, P. Welsch, J. I. Brand, P. A. Dowben, and J. P. Claassen

Appl. Phys. Lett. 80, 3644 (2002); http://dx.doi.org/10.1063/1.1477942 (3 pages) | Cited 39 times

Online Publication Date: 7 May 2002

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Real-time solid-state neutron detectors have been fabricated from semiconducting boron–carbon alloys, deposited by plasma-enhanced chemical vapor deposition. Single neutrons were detected and signals induced by gamma rays were determined to be insignificant. The source gas closo-1,2-dicarbadodecaborane (ortho-carborane) was used to fabricate the boron–carbon alloys with only the natural isotopic abundance of 10B. Devices made of thicker boron–carbon alloy layers enriched in 10B could lead to increased detection efficiency and active diodes could use the inherent micron scale spatial resolution, increasing the range of possible applications. © 2002 American Institute of Physics.
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29.40.Wk Solid-state detectors
81.05.Hd Other semiconductors

Depth and range shifting of a focal spot using a time-reversal mirror in an acoustic waveguide

Stéphane Conti, Philippe Roux, and Mathias Fink

Appl. Phys. Lett. 80, 3647 (2002); http://dx.doi.org/10.1063/1.1479208 (3 pages) | Cited 4 times

Online Publication Date: 7 May 2002

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We present a technique based on time reversal to focus an acoustic field at any depth and range in a waveguide. We take advantage of the signal received from an acoustic beacon in the guide to build a time-reversed modified version of the field that refocuses at a different point in the waveguide. This method is based on the application of the images theorem in the guide and, as in the classical time-reversal experiment, it does not require a priori knowledge of the waveguide characteristics. Ultrasonic laboratory experiments and underwater acoustic simulations are presented and compared to classical time-reversal focusing results. © 2002 American Institute of Physics.
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43.20.Mv Waveguides, wave propagation in tubes and ducts
43.58.-e Acoustical measurements and instrumentation
43.30.-k Underwater sound
43.35.-c Ultrasonics, quantum acoustics, and physical effects of sound
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