Talk:Surface plasmon resonance

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[edit] picture request

Can someone please make a picture to go with the new example? I tried to make the example as simple as possible, but I think that it would easily benefit from a picture of a window and a picture of a window with a gold film behind it.


[edit] scope of the article

Not sure how to go about sorting it yet, but this description of SPR is really about the application of the phenomenum in biological analysis rather than SPR itself, which a property most often observed in gold nanoparticles.

A solution that immediately springs to ming is to have this page talk about the phenomenon of Surface Plasmon Resonance described here, and to create a new page for Surface Plasmon Resonance Biosensors for the utilisation of the phenomenon in optical biosensors. Dwayne Dibly 23:20, 20 December 2005 (UTC)

Besides, Surface Plasmon Resonance is propagative while Surface Plasmon Polaritons on nanoparticules are localized.

Tried to create an SPR page that describes both planar SPR and localized SPR. Both are used for biosensing, but both can be used for other applications as well. User: Ucispr, 01 May 2006.

[edit] units of RU

What do the units of RU stand for? These are sometimes given with data and relate to the amount of bound species. - JamMan 4th Nov 06

RU = Response Units. There is a formula to compute this quantity, but roughly 0.1° SPR angle change corresponds to 1000 RU. Axelve 23:20, 8 November 2006 (UTC)
Oh, and that relates to roughly 1 nanogram per square millimeter (ng/mm^2) bound protein. Axelve 23:26, 8 November 2006 (UTC)

[edit] law enforcement tag

I removed the Law Enforcement tag, after reading the article I don't see that it has anything to do with LE. If I am wrong, because the articel is over my head, please put the tag back EMT1871 10:08, 20 January 2007 (UTC)

[edit] reorganization

Added a few things, some new figures as well. I did not remove anything, just reorganized. Feedback is welcome. (tomio- 20:40, 28 May 2007 (UTC))

[edit] Kretschmann

The pic with SPR setup uses a triangular prisma. Doesn't the Kretschmann setup us a semi-cylindrical prism? Benkeboy 13:21, 1 February 2007 (UTC)

I believe the Kretschmann configuration is defined by contact between the prism and the sample.
(JoeCarson 19:11, 1 February 2007 (UTC))
The Kretschmann configuration uses the metal film on a glass block, whatever shape it has. This result a shift in the dispersion relation (because the glass has a refractive index more than 1), and gives a possible resonance angle. This is reasonably described in the Raether book. Also, the plasmon propagates on the outer surface of the metal film in this setup, whilst in the Otto configuration -a gap between the glass block and the metal film- it propagates on the inner surface.
A prism shape is easier to get, a half cylinder has no refraction, which alters the incident angle on the film -it can be easily calculated though.(tomio- 14:06, 27 April 2007 (UTC))

[edit] Example

The example needs to be rewritten and should not be the first section of this article. I may have some useful pictures but not enough time or motivation to add them right now. If you give me an e-mail address here or on my talk page, I can send you a great book on surface plasmons with many useful diagrams. JoeCarson 13:50, 4 April 2007 (UTC)

What's the problem with the example? Looks like it's quite clear to me. Cannot we add it? --Cyclopia 11:30, 5 April 2007 (UTC)
The quality of writing is poor and it's too long. It also seems too oversimplified to do SPR justice. A shorter example with a good diagram would be preferable.JoeCarson 13:29, 5 April 2007 (UTC)
I agree, but itt's anyway better than nothing. It surely helps newbies on the subject even in its present state. I personally would readd it to the article, with a "not of encyclopedic quality" warning tag (don't remember the correct tag now, sorry). --Cyclopia 22:06, 5 April 2007 (UTC)
An example would be great. However, we need a good diagram and decent writing to go along with it. I believe leaving the page as is would be better than inserting that example.JoeCarson 11:26, 8 April 2007 (UTC)
I'm the guy who wrote the example. Personally, I understand your point. The main reason I added it was just to get "the ball rolling". Almost all of the Physics Wiki pages are too technical, and could easily benefit from an example. Anyways, my email address is tjm1@ualberta.ca. If you could send me that book, I can try to make the example better. I am not going to increase the english standard that its at, but I have no problem with someone else updating it. —The preceding unsigned comment was added by 68.148.190.156 (talk) 18:32, 15 April 2007 (UTC).
If I have some time, I can dig up some full resonance curves from my data. I would add that to the example, showing how the SPR data looks in general, then the given adsorpion response curve can be interpreted more clearly by the readers. I would also update a bit, if you do not mind 8). (tomio- 14:09, 27 April 2007 (UTC))
I have absolutely no problem with that. I have been swamped by finals, and so have not been able to redo the example. I am definetly not an expert in this area, so any information you could add would be very beneficial.talk) 18:32, 15 April 2007 (UTC)

[edit] Electric/electronic/magnetic plasmons

It would be nice if one could clear up the usage of electric or electronic for the SPR, and what is exactly the magnetic SPR.

  • the light used for excitation is electromagnetic radiation
  • the electron beam is an electron beam
  • the plasmon is an oscillation phenomena of electrons (affected by both electric and magnetic fields)

(tomio- 12:49, 2 June 2007 (UTC))

[edit] Realisation

I am not entirely sure but where it says "In the case of p-polarized light (polarization occurs parallel to the surface)" isn't p-polarized light parallel to the plane of incidence, not the surface. I thought it would be perpendicular to the surface. Let me know what you think. P.s. this is my first Wikidiscussion. Let me know if I screwed up.

Helicopter34234 (talk) 19:03, 1 February 2008 (UTC)

You were right, I had a look into it. It is corrected now. (tomio- (talk) 02:48, 30 April 2008 (UTC))

Also under this section, could you please define the variables more clearly? A mass-independent version (I assume mu refers to the mass-per-volume) of this equation is given in a nature article (k = k0 * sqrt(e1*e2 / (e1 + e2)).

Motrax (talk) 17:36, 6 April 2008 (UTC)