A Raman spectroscopy system is disclosed which includes a sub-wavelength resonant grating filter and a photodiode with integrated sub-wavelength resonant grating filter are disclosed. The resonant grating filter comprises an array of diffraction elements having a periodic spacing that is less than the...http://www.google.de/patents/US7474396?utm_source=gb-gplus-sharePatent US7474396 - Raman spectroscopy system and method using a subwavelength resonant grating filter
