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Optical logic device and optical memory device
| Details |
Inventors: Usami, Yoshihisa; Naya, Masayuki; Inagaki, Yoshio;
Assignee: Fuji Photo Film Co., Ltd. (Kanagawa-ken, JP)
Primary Examiner: Spyrou; Cassandra
Assistant Examiner: Juba, Jr.; John
Attorney, Agent or Firm: Sughrue Mion, PLLC
An optical logic device comprises a dielectric block arranged such that a driving light is incident on one plane thereof at a total reflection critical angle through an interior thereof, a metallic film formed over the one plane of the dielectric block, and an optical functional film, a refractive index of which is changed by irradiation of light, formed over the metallic film such that the optical functional film is irradiated with a control light. A surface plasmon device is fabricated, which comprises a dielectric block arranged such that a driving light having a uniform intensity is incident on one plane thereof at a total reflection critical angle through an interior thereof, a metallic film formed over the one plane of the dielectric block, an optical functional film, a refractive index of which is changed by irradiation of light, formed over the metallic film such that the optical functional film is irradiated with a signal light subjected to space modulation. The driving light reflected on the one plane upon irradiating the optical functional film with the signal light is made incident on the optical functional film by an optical system. |
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DETAILED DESCRIPTION The invention has been developed in view of the circumstances described above, and an object of the invention is to provide an optical logic device having a simple constitution that can be produced at a low cost, as well as an optical logic circuit and an optical oscillation circuit, which are inexpensive and have a high operation speed, obtained by combining the same.
The invention relates to an optical logic device performing a logic operation with respect to one or plural input lights, the optical logic device comprising a dielectric block arranged in such a manner that a driving light is incident on one plane thereof at a total reflection critical angle through an interior thereof, a metallic film formed over the one plane of the dielectric block, and an optical functional film, a refractive index of which is changed by irradiation of light, formed over the metallic film in such a manner that the optical functional film is irradiated with a control light.
In the optical logic device according to the invention, the incident angle of the driving light on the one plane of the dielectric block is set, for example, at such an angle that when the optical functional film is irradiated with the control light, the surface plasmon resonance is relatively strongly excited on the metallic film, and when the optical functional film is not irradiated with the control light, the surface plasmon resonance is relatively weakly excited or is not excited.
The device of this type is hereinafter called an optical logic device of the mode a.
Contrary to the above, the incident angle of the driving light on the one plane of the dielectric block may be set at such an angle that when the optical functional film is not irradiated with the control light, the surface plasmon resonance is relatively strongly excited on the metallic film, and when the optical functional film is irradiated with the control light, the surface plasmon resonance is relatively weakly excited or is not excited.
The device of this type is hereinafter called an optical logic device of the mode b
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Optical Systems 
