Can the Plasmon Frequency in Metals Be Changed Experimentally?

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Hi guys;

I have a question about the Plasmon frequencies in metals I know that it can be calculated as following:
ωp2=Ne2/ε0meff
I was just wondering if anyone knows it is possible to change the plasmon frequency of any metal let say silver experimentally or not. I am working on metallic photonic crystals I want to find the effect of plasmon frequency on photonic band gap.
Thanks
 
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Change either the electron density or the electrons effective mass.
 

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