| 摘要 |
PROBLEM TO BE SOLVED: To constitute a guide mode of a surface plasmon propagated along a light guide interface by forming the interface between the materials having permittivity of opposite signs in a clad area. SOLUTION: A long-wavelength semiconductor laser 10 is composed of an active area 12 and at least one guide interface 14. The interface 14 is based on a surface plasmon. The interface 14 is formed of a pair of layers 14.1 and 14.2 having permittivity of opposite signs. For example, the layer 14.1 is formed of a semiconductor having a positive permittivity and the layer 14.2 is formed of a metal having a negative permittivity. The guide mode in the active area 12 is supported at least partly by an electromagnetic surface wave (surface plasmon) at the metal-semiconductor interface 14. Since the amplification of light waves exponentially decreases in two directions perpendicular to the interface 14, no additional clad layer is required.
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