NOVELTY - The light harvesting arrangement (100) comprises a conductive layer (102) defining cavities through the conductive layer, and a light utilizing material (108) disposed on the walls of the cavities and configured to absorb light captured by the cavities. Each cavity has a lateral cross-sectional dimension of 25-3000 nm. The cavities are configured to capture light in a wavelength band. The wavelength band captured by the cavities is based, in part, on the lateral cross-sectional dimension of the respective cavity. The light of the particular wavelength band excites surface plasmons.    USE - The light harvesting arrangement is useful in photovoltaic cells for generating electrical energy, and performing chemical reactions such as hydrolysis of water.    ADVANTAGE - The light harvesting arrangement is capable of efficiently absorbing a portion of the light in the wavelength band that corresponds to surface plasmon modes on the walls of the cavity or optical cavity modes within the cavity, and can perform the task of long-lived light induced charge separation and vectorial electron transfer.    DETAILED DESCRIPTION - The light harvesting arrangement (100) comprises a conductive layer (102) defining cavities through the conductive layer, and a light utilizing material (108) disposed on the walls of the cavities and configured to absorb light captured by the cavities. Each cavity has a lateral cross-sectional dimension of 25-3000 nm. The cavities are configured to capture light in a wavelength band. The wavelength band captured by the cavities is based, in part, on the lateral cross-sectional dimension of the respective cavity. The light of the particular wavelength band excites surface plasmons or optical cavity modes or both in the respective cavity. The light utilizing material comprises organic compounds, organometallic compounds and complexes, and biomolecules. Each of the cavities has a lateral cross-sectional shape that is circular, elliptical, rectangular, square, C- and L-shaped or bowtie-shaped. The cavities comprise first and second cavities. The first cavities are different from the second cavities. The first cavities are configured to capture light in a first wavelength band and the second cavities are arranged to capture light in a second wavelength band. The conductive layer further defines an isolation groove (104) separating sections of the conductive layer. An INDEPENDENT CLAIM is included for a method of making a light harvesting arrangement.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic perspective view of a light harvesting arrangement.    Light harvesting arrangement (100)    Conductive layer (102)    Grooves (104)    Substrate (106)    Light utilizing material. (108)