This question is more in regard to the resonant structures used for sensing applications, namely surface plasmon resonance, photonic crystals and guided-mode resonance based devices, etc which all show a spectral redshift on increasing the refractive index of the top region. I don't remember coming across photonic structures wherein the spectral resonant response blueshifts as we increase the top refractive index. Is it possible for a structure to do so? And if not, why?
Dear Mr. Vipul Pandey!
If You want to convert red light to green or blue use nonlinear crystals (for example: KDP
https://en.wikipedia.org/w/index.php?title=Second-harmonic_generation&oldid=947309549 ).
Sincerely, Ivan Ivanovich Dolgov 20200410 Д\д
If you are in the linear optical regime, then the spectral response of the photonic structure is independent of the incident wavelength. The spectral response is the wavelength dependent transmission/reflection,.... of the structure. wavelength-dependent.
blueshift is any decrease in wavelength (increase in energy), with a corresponding increase in frequency, of an electromagnetic wave; the opposite effect is referred to as redshift.
In visible light, this shifts the color from the red end of the spectrum to the blue end.
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