Patent ID: 7728366

Claim:
An optical interconnection module comprising: a photodiode for receiving incident light emitted from a first optical fiber to generate a first signal; a light source for generating a signal light that is irradiated into a second optical fiber; and a mounting board on which said photodiode and said light source are arranged; wherein said first signal is supplied to an LSI, and said light source generates the signal light in accordance with a second signal from said LSI; said photodiode comprising: a conductive film having: an aperture having a diameter smaller than the wavelength of said incident light, and a periodic structure provided around said aperture for producing a resonant state by an excited surface plasmon in a film surface of said conductive film by means of said incident light to said conductive film; and a semiconductor layer provided in a vicinity of said aperture of said conductive film and in contact with said conductive film; wherein said photodiode detects near-field light that is generated at an interface between said conductive film and said semiconductor layer by said excited surface plasmon.