Eric, Your calculations are correct, but present a problem. At least to me. It is very easy to generate a broad spectrum with a peak of some 30THz. Just heat up your cooking plate, so to say. The problem -to my opinion- is twofold:
a) spatial: Any emitter has a certain area-density of emission. and the best we can do is concentrate this emission onto the receiver 1:1, on said area basis. The sun being a good example. Surface-temperature of the sun being say 5000K. You never can surpass this temperature at the receiving side (via a burning glass or concentrating mirror). Emitters like the sun or a heating plate are variants of Lambert-emitters. https://en.wikipedia.org/wiki/Lamberts_cosine_law To collect all those emissions, you need a big lens, especially if emitter and receiver are whithin close distance (unlike the sun) b) spectral now, if You want say 30--30.1THz, you cut out only a small segment of the whole emission. The smaller the interval of interest, the smaller the amount of energy within that, right? If You translate this to area-density, You get uW to mW at best per mm2. Now, to overcome this, you need a generator, like a Laser or some other electronic device (RF-generator) with an antenna, which would look quite cute, like a wood of nanowires. Now in the 30THz regime there are no generators, only Lasers. (Electronic generators in the 30GHz regime are quite a feat currently. And those are extremely low power. See eg LeCroy, the oscilloscope-manufacturer. They try to conquer the 100Ghz regime, which is 0.1THz, a meager factor of 300 below 30THz. ) THz lasers (say: 5THz) of significant power are a research topic. Google "High power THz Laser" and You see what I mean. The highest I could see is a theoretical power of 100W with efficiency in the 1%-region. So this is not an attractive option. As a final comment: To bring a nanostrucure into resonance needs, say a certain specific frequency with a bandwidth of 1%. This is just a reasonable guess. All other frequencies present possibly/probably -I do not know- HINDER/PREVENT the effect! The philosopher in me sees this as a feature, not a bug in the construction of the Universe. In the other case it would have exploded long time ago, So the stability of the universe, as we experience it, is a living proof for affairs as they are. A tautology this is. This is not quite the same as the anthropic principle, but some close relative. Tricking this is a nifty endeavor. Guenter ________________________________ Von: Eric Walker <eric.wal...@gmail.com> An: vortex-l@eskimo.com Gesendet: 4:56 Freitag, 27.Juli 2012 Betreff: Re: [Vo]:FYI: THz pulses can drive lattice vibrations directly... On Thu, Jul 26, 2012 at 4:17 PM, Guenter Wildgruber <gwildgru...@ymail.com> wrote: guys, whatever that is, do You really think that Rossi put something like that into real world commercial operation? >THz pulses with significant energy? > From my reading I've concluded that THz is basically infrared. Sometimes I've seen a distinction made between it and infrared, and at other times I have not: http://en.wikipedia.org/wiki/File:Light_spectrum.svg An application on a Web page is telling me that the blackbody radiation for an object at 300 C (573 K) is 30 THz, with a lower limit of 24 THz and an upper limit of 37 THz. So 300 C would seem to be the goldilocks zone as far as terahertz radiation is concerned. You don't need a fancy terahertz RF pulse device; you just heat something up. Eric