As the sub wave length resonance lattice filter (508) the Raman spectrum system which is included (600) is disclosed, the photodiode which possesses the accumulation sub wave length resonance lattice filter is disclosed. The resonance lattice filter (608), it possesses the periodic interval which is shorter than the emission wave length which filtering is done guided wave road layer (110) the diffraction element which is formed on (104) it includes array. While transmitting other wave length, from the sample elasticity in order filtering to do the emission which disperses, the filter which can cut off the emission wave length of specification (608), the Raman sample and the Raman detector (602) with it is possible to arrange between. As for the wave length which is cut off by that filter, vis-a-vis the emission which incidence is done on that filter the filter (608), it is possible to select by being able to tilt.
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