Abstract
We propose a novel ultra-low loss single-mode hollow-core waveguide using subwavelength high-contrast grating (HCG). We analyzed and simulated the propagation loss of the waveguide and show it can be as low as 0.006 dB/m, three orders of magnitude lower than the lowest loss of the state-of-art chip-scale hollow waveguides. This novel HCG hollow-core waveguide design will serve as a basic building block in many chip-scale integrated photonic circuits enabling system-level applications including optical interconnects, optical delay lines, and optical sensors.
Highlights
The ability to generate long optical delays with low intrinsic loss is useful for a wide range of applications, including optical signal processors, RF filtering, optical buffers, and optical sensing
We showed that its incorporation as the top mirror of a vertical cavity surface emitting laser (VCSEL) [7,8,9] as well as a high-Q resonator [10]
We show an high-contrast grating (HCG) hollow-core slab waveguide design with an exceedingly low propagation loss (
Summary
The ability to generate long optical delays with low intrinsic loss is useful for a wide range of applications, including optical signal processors, RF filtering, optical buffers, and optical sensing. We propose a novel ultra-low loss hollow-core waveguide structure using HCGs as the high reflectivity cladding to reflect light at a small glancing angle. In the case of a high-contrast grating hollow core waveguide, the confinement is due to the constructive interference of multiple grating harmonics in a sub-wavelength periodic structure [12]. This is a totally unexplored concept in guided-wave optics: propagation parallel to the direction of periodicity of a periodic structure using just one layer of HCG on each side to provide lateral confinement. We show a potential 2D design with loss estimated to be less than 0.01 dB/m
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