Patent ID: 7567606

Claim:
Semiconductor laser comprising: a substrate providing the mechanical support function, an active area having a first intrinsic refractive index and an effective refractive index, in which a light wave is propagated with a wavelength λ designed for lasing, a top waveguide having a second intrinsic refractive index and a thickness, and, on the surface, a grating structure at least partially covered by a layer of material, the dielectric permittivity of which presents a negative real part, such as, for example, metal, said grating having a period and a depth, a bottom waveguide having a third intrinsic refractive index, wherein: the depth of said grating is between approximately [ 0 ⁢ , 5 × λ 4 × neff ] and approximately [ 1 , 5 × λ 4 × neff ] , so as to introduce a modulation of the effective index of the active area making it possible to obtain a stable and controlled feedback.