NOVELTY - The optoelectronic device (70) has an insulating substrate with an electrode gap that separates a right side electrode (30) and a left side electrode (32). A semiconductor layer which spans electrode gap provides a photoconductive electrical conduit between electrodes. Several plasmonic nano particles (45) which abut a portion of semiconductor layer have a plasmon resonance spectrum. The optoelectronic device has wavelength-dependent enhanced efficiency across portion of plasmon resonance spectrum that is compared to optoelectronic device without plasmonic nano particles.    USE - Photoconductive optoelectronic device e.g. photo detector such as gold plasmonic nano particle photo detector, silver plasmonic nano particle photo detector, or photovoltaic such as solar cell used in imaging applications.    ADVANTAGE - The certain wavelengths of light produces plasmonic excitation in the plasmonic nano particles based on the size and composition of the plasmonic nano particles, so that strong enhanced optical power density is obtained at the surface of the nano particles. This enhanced optical power density contributes to the photoconductivity of the semiconductor layer, so that the overall photoconductive properties of the device are improved. The plasmonic enhancement provided by the plasmonic nano particles manifests itself by improving the efficiency of the optoelectronic device which has increased probability of detecting an incident photon having a wavelength within the plasmon-enhanced spectral region, compared to a similar photo detector without the plasmonic. The wavelength-dependent enhancement of the provided devices arises from the plasmon resonance of the nano particles. The external quantum efficiency (EQE) is improved through one or more of improved absorption and/or carrier mobility, and/or the addition of conduction paths between the electrodes.    DESCRIPTION OF DRAWING(S) - The drawing shows the cross-sectional view of the photo detector integrated with plasmonic nano particles.    Substrate (15)    Right side electrode (30)    Left side electrode (32)    Nano particles (45)    Optoelectronic device (70)