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krisi
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re: Optical antenna said to boost signals
krisi   9/23/2010 4:21:03 PM
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Douglas, this development sounds very exciting although there is obviously a fair amount of work before you can take advantage of it. I wonder whether you have any industrial sponsor for your research or is this too far for industry to notice?...Kris

Douglas Natelson
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re: Optical antenna said to boost signals
Douglas Natelson   9/23/2010 4:13:44 AM
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For what it's worth, this effect is present at room temperature. We ran the experiment at lower temperatures for two reasons. First, reducing the temperature hinders the mobility of the Au atoms. (At room temperature, Au is surprisingly mobile, and a Au tunnel junction will show big changes in conductance as a function of time as the Au atoms at the tips move around.) Second, we wanted to work in a decent vacuum to avoid adsorbed contaminants, and cooling helps. If you make junctions like this in ambient conditions, they are rapidly coated with a monolayer of physisorbed water and pollutants, which you don't want if you're trying to understand the underlying physics.

pixies
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re: Optical antenna said to boost signals
pixies   9/22/2010 2:56:07 PM
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These types of effects usually are washed out at higher temperature. Unless they can point out a way to make it work at room temperature, it will hard to find an application for it.

R_Colin_Johnson
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re: Optical antenna said to boost signals
R_Colin_Johnson   9/22/2010 3:56:58 AM
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Most optical materials are of the clear plastic variety, formed into optical fiber, but these Rice University researchers are using an angstrom-scale air-gap between gold electrodes to harness the amplification effect of plasmons, but at optical frequencies. Although such effects have been demonstrated before, this group claims to be the first to explain why the technique works as well as the first to measure how much optical signals can be amplified by angstron-scale nanogaps. When commercialized, this effect could enable sensors so sensitive that they detect a single molecule of nearly any substance. What application would you create if you had a single-molecule sensor?



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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