Reflection-phase variation of cavity-resonator-integrated guided-mode-resonance reflector for guided-mode-exciting surface laser mirror

Surface mount packaging of a vertical-cavity surface-emitting laser (VCSEL) on an optical board and the input coupling of the wave launched from the VCSEL into a small-number-mode waveguide integrated in the optical board are key issues to construct a future high-density on-board optical interconnect system. A problem in practical applications is too high precision alignment and stability in packaging. Potential solutions would include a combination of a half-VCSEL and an external mirror integrated in the waveguide. A new type of mirror named a cavity-resonator-integrated guided-mode-resonance mirror (CRIGM) is investigated to serve as a laser mirror as wall as an input coupler because it can provide both functions of high reflectivity and simultaneous excitation of the guided mode. A reflection-phase variation of CRIGM takes an important role to construct such a VCSEL. In this paper, a wavelength dependence of the reflection phase is discussed theoretically and demonstrated experimentally.