Now this... this is *really* fast

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DecadentLinuxUserNumeroUn

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http://www.gigoptix.com/technology/indium-phosphide-technology/
 
A pal of mine from grad school, Mark Rodwell, has been trying to make 1 THz transistors for awhile now. Eventually you get limited by the plasma frequency of the free charge, which iirc is a few THz in semiconductors but a few petahertz in metals. That's one reason I worked on metal-insulator-metal (MIM) junctions--they're fast enough to rectify light.

Cheers

Phil Hobbs
 
So a solar panel made as a crystal set comprising zillions of tiny
antennae feeding individual high speed rectifiers to solve the world's
energy problems!
Click to expand...

You laugh. Some of my devices got above 7% quantum efficiency, and that was with basically just me working on it. (I did much of the processing and even wrote a big-iron optimizing EM simulator code to get there.) If the shunt resistance can be increased and the asymmetry improved, it could be.

I have a project along those lines in the offing--the PO has been cut, but I'm waiting for the State Department to rule on whether it's ITAR-controlled or not. (The customer is overseas.)

Cheers

Phil Hobbs
 
On Wednesday, November 4, 2015 at 9:34:35 AM UTC-8, Robert Baer wrote:

So a solar panel made as a crystal set comprising zillions of tiny
antennae feeding individual high speed rectifiers to solve the world's
energy problems!

Would the overall efficiency be abut the same as the conventional
photo capture method?
Click to expand...

Better; solar cells use a mechanism that is forever limited to 50% energy
recovery, while an array of rectennae is only limited by impedance
matching (if you know the input is narrowband, it's easy to make the
correct geometry).
 
On Wednesday, November 4, 2015 at 1:07:53 PM UTC-5, whit3rd wrote:
On Wednesday, November 4, 2015 at 9:34:35 AM UTC-8, Robert Baer wrote:

So a solar panel made as a crystal set comprising zillions of tiny
antennae feeding individual high speed rectifiers to solve the world's
energy problems!

Would the overall efficiency be abut the same as the conventional
photo capture method?

Better; solar cells use a mechanism that is forever limited to 50% energy
recovery, while an array of rectennae is only limited by impedance
matching (if you know the input is narrowband, it's easy to make the
correct geometry).
Click to expand...

I was going to ask why 50 % but I found this...
https://en.wikipedia.org/wiki/Shockley%E2%80%93Queisser_limit

George H.
 
On 04/11/2015 14:30, Phil Hobbs wrote:
A pal of mine from grad school, Mark Rodwell, has been trying to make 1 THz transistors for awhile now. Eventually you get limited by the plasma frequency of the free charge, which iirc is a few THz in semiconductors but a few petahertz in metals. That's one reason I worked on metal-insulator-metal (MIM) junctions--they're fast enough to rectify light.

Cheers

Phil Hobbs
Click to expand...
So a solar panel made as a crystal set comprising zillions of tiny
antennae feeding individual high speed rectifiers to solve the world's
energy problems!

Cheers
--
Syd
 
On Wed, 4 Nov 2015 15:21:28 +0000, Syd Rumpo <usenet@nononono.co.uk>
Gave us:

snip
So a solar panel made as a crystal set comprising zillions of tiny
antennae feeding individual high speed rectifiers to solve the world's
energy problems!

Cheers
Click to expand...

You should tell Tesla.
 
On Wed, 4 Nov 2015 15:21:28 +0000
Syd Rumpo <usenet@nononono.co.uk> wrote:

On 04/11/2015 14:30, Phil Hobbs wrote:
A pal of mine from grad school, Mark Rodwell, has been trying to
make 1 THz transistors for awhile now. Eventually you get limited
by the plasma frequency of the free charge, which iirc is a few THz
in semiconductors but a few petahertz in metals. That's one reason
I worked on metal-insulator-metal (MIM) junctions--they're fast
enough to rectify light.

Cheers

Phil Hobbs

So a solar panel made as a crystal set comprising zillions of tiny
antennae feeding individual high speed rectifiers to solve the
world's energy problems!

Cheers
Click to expand...

Not as crazy as it might seem to you!

http://beforeitsnews.com/energy/2013/03/a-new-solar-power-antenna-2448044.html
https://inlportal.inl.gov/portal/server.pt?open=514&objID=1269&mode=2&featurestory=DA_101047
https://en.wikipedia.org/wiki/Nantenna

joe
 
On Wed, 4 Nov 2015 15:21:28 +0000, Syd Rumpo <usenet@nononono.co.uk>
wrote:

On 04/11/2015 14:30, Phil Hobbs wrote:
A pal of mine from grad school, Mark Rodwell, has been trying to make 1 THz transistors for awhile now. Eventually you get limited by the plasma frequency of the free charge, which iirc is a few THz in semiconductors but a few petahertz in metals. That's one reason I worked on metal-insulator-metal (MIM) junctions--they're fast enough to rectify light.

Cheers

Phil Hobbs

So a solar panel made as a crystal set comprising zillions of tiny
antennae feeding individual high speed rectifiers to solve the world's
energy problems!

Cheers
Click to expand...

'Rectannas' for microwaves have been around for a while, but optical
frequencies appear to be a bit more of a challenge...



--sp




--
Best regards,
Spehro Pefhany
Amazon link for AoE 3rd Edition: http://tinyurl.com/ntrpwu8
Microchip link for 2015 Masters in Phoenix: http://tinyurl.com/l7g2k48
 
Syd Rumpo wrote:
On 04/11/2015 14:30, Phil Hobbs wrote:
A pal of mine from grad school, Mark Rodwell, has been trying to make
1 THz transistors for awhile now. Eventually you get limited by the
plasma frequency of the free charge, which iirc is a few THz in
semiconductors but a few petahertz in metals. That's one reason I
worked on metal-insulator-metal (MIM) junctions--they're fast enough
to rectify light.

Cheers

Phil Hobbs

So a solar panel made as a crystal set comprising zillions of tiny
antennae feeding individual high speed rectifiers to solve the world's
energy problems!

Cheers
Click to expand...
Would the overall efficiency be abut the same as the conventional
photo capture method?
 
On 11/04/2015 01:07 PM, whit3rd wrote:
On Wednesday, November 4, 2015 at 9:34:35 AM UTC-8, Robert Baer wrote:

So a solar panel made as a crystal set comprising zillions of tiny
antennae feeding individual high speed rectifiers to solve the world's
energy problems!

Would the overall efficiency be abut the same as the conventional
photo capture method?

Better; solar cells use a mechanism that is forever limited to 50% energy
recovery, while an array of rectennae is only limited by impedance
matching (if you know the input is narrowband, it's easy to make the
correct geometry).
Click to expand...

It's a little more complicated than that. Tunnel junction rectennas
operate in different physical regimes for different frequencies. In the
low-energy limit (h nu / e << junction turn-on voltage), it's like at
RF: the voltage at the antenna terminals walks the junction up and down
its I-V curve, and everything works like you expect.

The medium-energy regime, h nu / e ~ V_J is the photon-assisted
tunnelling situation, where the incoming light puts a bump on the I-V
curve near V= h nu/e.

In the high energy regime, h nu / e > V_J, what's going on is internal
photoemission over the tunnel barrier.

AFAIK there's no good theoretical treatment of cases 2 and 3 for the
normal-metal case. Everybody still uses Simmons's papers from 1963,
which are only good in the low energy limit, but seem to give reasonable
zero-order guesses for the other cases, which is sort of odd, actually.

Case 3 is in some ways like a normal photodiode in some ways--the
voltage you can get is limited by the turn-on voltage of the junction.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510

hobbs at electrooptical dot net
http://electrooptical.net
 
On Wed, 4 Nov 2015 13:16:52 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> Gave us:

On 11/04/2015 01:07 PM, whit3rd wrote:
On Wednesday, November 4, 2015 at 9:34:35 AM UTC-8, Robert Baer wrote:

So a solar panel made as a crystal set comprising zillions of tiny
antennae feeding individual high speed rectifiers to solve the world's
energy problems!

Would the overall efficiency be abut the same as the conventional
photo capture method?

Better; solar cells use a mechanism that is forever limited to 50% energy
recovery, while an array of rectennae is only limited by impedance
matching (if you know the input is narrowband, it's easy to make the
correct geometry).


It's a little more complicated than that. Tunnel junction rectennas
operate in different physical regimes for different frequencies. In the
low-energy limit (h nu / e << junction turn-on voltage), it's like at
RF: the voltage at the antenna terminals walks the junction up and down
its I-V curve, and everything works like you expect.

The medium-energy regime, h nu / e ~ V_J is the photon-assisted
tunnelling situation, where the incoming light puts a bump on the I-V
curve near V= h nu/e.

In the high energy regime, h nu / e > V_J, what's going on is internal
photoemission over the tunnel barrier.

AFAIK there's no good theoretical treatment of cases 2 and 3 for the
normal-metal case. Everybody still uses Simmons's papers from 1963,
which are only good in the low energy limit, but seem to give reasonable
zero-order guesses for the other cases, which is sort of odd, actually.

Case 3 is in some ways like a normal photodiode in some ways--the
voltage you can get is limited by the turn-on voltage of the junction.

Cheers

Phil Hobbs
Click to expand...

Maybe it is a case of (side) lobal warming. :)
 
In article <n1d7la$ffj$1@dont-email.me>,
Syd Rumpo <usenet@nononono.invalid> wrote:
On 04/11/2015 14:30, Phil Hobbs wrote:
A pal of mine from grad school, Mark Rodwell, has been trying to make
1 THz transistors for awhile now. Eventually you get limited by the
plasma frequency of the free charge, which iirc is a few THz in
semiconductors but a few petahertz in metals. That's one reason I worked
on metal-insulator-metal (MIM) junctions--they're fast enough to rectify
light.

So a solar panel made as a crystal set comprising zillions of tiny
antennae feeding individual high speed rectifiers to solve the world's
energy problems!
Click to expand...

And I remember seeing a patent on that. An example in a whiz-bang article
about "super-inventors", one of those guys who patented a record number
of patents. Basically, every idea where he could get legal paper.
(Lemulson(?)).

There was a news item in a recent New Scientist about a report of the
development of one of the blackest black coatings. It was described as a
coating containing hammer shaped gold nanostructures. One thing was that it
could be combined with a dye so that it would absorb energy on a broad
range of wavelengths and emit the light on the one determined by the dye.

First thought: combine this with the rectenna solar cell tuned the
output color/frequency of the dye.


Mark Zenier mzenier@eskimo.com
Googleproofaddress(account:mzenier provider:eskimo domain:com)
 
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