| 摘要 |
The invention relates to a wavelength-selective resonant-cavity transmission filter (10) comprising: a planar central portion (PC) extending in a horizontal plane XY, comprising: a coupling grating (CG) having a first periodic variation in dielectric permittivity; first and second lateral phase zones (ZL1, ZL2) devoid of periodic permittivity, and placed on either side of the coupling grating (CG) and adjacent to the latter; first and second vertical phase zones (ZV1, ZV2) devoid of periodic permittivity and placed on either side of the coupling grating (CG); first and second lateral high-reflectivity structures (HRL1, HRL2) placed on either side of the central portion (PC), adjacent to the first and second lateral phase zones, respectively, in order to laterally confine the localized mode (Ol); and first and second vertical high-reflectivity structures (HRV1, HRV2) placed on either side of the central portion (PC), for vertically confining the localized mode (Ol) and for reflecting an incident wave (Oinc) having wavelengths belonging to a spectral reflection band (Δλ) comprising the resonant wavelength, said filter forming a resonant cavity for the localized mode (Ol). |
