KEYWORDS: Waveguides, Mirrors, Photonics, Integrated optics, Near field optics, Dielectrics, Near field scanning optical microscopy, Reflectivity, Dispersion, Optical design
We study and demonstrate a Bloch-surface-wave-based nano-thin waveguide grating. The waveguide grating is characterized as a Bragg mirror at telecommunication wavelengths. The structure is a dielectric multilayer platform designed to sustain a Bloch surface wave. Such a platform is regarded as a foundation for in-plane integrated optics. The Kretschmann coupling configuration, as the most widely used approach, is utilized to excite the optical surface waves. We use multi-heterodyne scanning near-field optical microscopy to characterize the waveguide gratings in the near-field. The fabricated waveguide grating shows the expected Bragg mirror behavior with a measured reflectivity of approximately 72 % inside the photonic band gap at λ = 1553 nm.
We study the Bloch surface wave based nano-thin 2D optical components. The 2D elements are fabricated on the dielectric multilayer platform which sustains the Bloch surface waves. Such a platform is considered as a novel foundation for planar integrated optics. We exploit the total internal reflection configuration to achieve the phase matching condition for BSW excitation. Because of the evanescent behavior of the BSW, we use a scanning near field optical microscope to characterize the near-field properties of in-plane components. The 2D optical components include Disk resonators and Bessel-like beams.
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