I have tried Sigma and Candot like companies but they have only Au NPs which has absorption at 500-600 nm wavelength only. Many thanks
If you want spherical Au NPs, this would be impossible.
It may be possible, but it will be hard, with nanorods or core-shells. Or perhaps with silver nanoplates, if you are willing to change material.
Have a look at: http://nanocomposix.com/pages/plasmonic-nanoparticles
They can synthesize custom NPs and they MAY be able to go up to 1500nm.
What would be the embedding medium? This will also have an effect on the resonance wavelength; for example NPs embedded in glass will have a slightly different resonance relative to the same NPs in water.
If you are not very particular about the shape, nanorods can be synthesized with LSPR more than 1200 nm. As you know LSPR is size dependent and when you increase the size of the spheres to match the LSPR you need, they will aggregate and grow into other shapes. Hence it is not possible to have spheres with LSPR of 1500 nm. you can contact: http://www.nanopartz.com/ to know if they can synthesis nanorods for you with 1500nm LSPR
Thank you so much David and Ramya.
Yes, you are right David. The SPR will shift in my case where I want to buy Au NPs in organic solvent and then do some chemistry in-order to deposit those on quartz as a thin film. Now I think simulation will tell that shift. By the way do you have any idea to calculate that shift ?
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