Patent ID: 8086108

Claim:
An optical transmission/reception device comprising: at least one light emitting portion; and at least one light receiving portion, wherein the light emitting portion and the light receiving portion are provided on the same substrate, the light emitting portion includes at least a lower multilayer reflector and an active layer provided on the lower multilayer reflector, and a first metal layer including a plurality of opening portions is provided in an upper portion of the light emitting portion, each of the plurality of opening portions having a size smaller than a light emission wavelength of the light emitting portion, wherein the plurality of opening portions of the first metal layer in the light emitting portion are arranged in a square grid pattern, a grid interval of the opening portions satisfies: 0.9 ×P ≦λ×( i 2 +j 2 ) 1/2 (∈ 1 ∈ 2 /∈ 1 +∈ 2 )) 1/2 ≦1.1 ×P, where P represents the grid interval of the opening portions, ∈ i represents a dielectric constant of the first metal layer, ∈ 2 represents a dielectric constant of a medium contacting an upper or lower surface of the first metal layer, λ represents the light emission wavelength of the light emitting portion, and i and j represent non-negative integers.