X-Message-Number: 21580
From: 
Date: Fri, 11 Apr 2003 05:51:36 EDT
Subject: saser

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Gia-Wei Chern et al. give in cond-mat/0301031 a theory of production and 
propagation of terahertz phonons in semiconductors. I would class this paper 
as hard, it needs some paper and pencil to be understood. Femtosecond UV 
laser pulses can excite longitudinal (compression) and lateral (shear) phonon 
waves in heterostructure semiconductors. From my reading I conclude that in a 
disordered material such a frozen brain such saser radiation would dissipate 
well before it can travel beyond some cells length. One possibility is to use 
phonon solitons, but these would have to propagate in one dimensional 
structure. This may be achieved by nondispersive beams (hollow beams with 
special radial energy profile).

Given that the intensity interferometer detector is frequency insensitive, it 
could get the sought after resolution with either phaser (GHz) phonons or 
saser (THz) ones. Given the knowledge on these system today, no choice can be 
done, both ways must be explored.

Y. Bozzonetti.

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