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Guided Mid-IR and Near-IR Light within a Hybrid Hyperbolic-Material/Silicon Waveguide Heterostructure | | Mingze He
; Sami I. Halimi
; Thomas G. Folland
; Sai S. Sunku
; Song Liu
; James H. Edgar
; Dmitri N. Basov
; Sharon M. Weiss
; Joshua D. Caldwell
; | | Date: |
12 Jun 2020 | | Abstract: | Silicon waveguides have enabled large-scale manipulation and processing of
near-infrared optical signals on chip. Yet, expanding the bandwidth of guided
waves to other frequencies would further increase the functionality of silicon
as a photonics platform. Frequency multiplexing by integrating additional
architectures is one approach to the problem, but this is challenging to design
and integrate within the existing form factor due to scaling with the
free-space wavelength. Here, we demonstrate that a hexagonal boron nitride
(hBN)/silicon hybrid waveguide can enable dual-band operation at both
mid-infrared (6.5-7.0 um) and telecom (1.55 um) frequencies, respectively. Our
device is realized via lithography-free transfer of hBN onto a silicon
waveguide, maintaining near-infrared operation, while mid-infrared waveguiding
of the hyperbolic phonon polaritons (HPhPs) in hBN is induced by the index
contrast between the silicon waveguide and the surrounding air, thereby
eliminating the need for deleterious etching of the hBN. We verify the behavior
of HPhP waveguiding in both straight and curved trajectories, and validate
their propagation characteristics within an analytical waveguide theoretical
framework. This approach exemplifies a generalizable approach based on
integrating hyperbolic media with silicon photonics for realizing frequency
multiplexing in on-chip photonic systems. | | Source: | arXiv, 2006.6920 | | Services: | Forum | Review | PDF | Favorites | |
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