Journal
ADVANCED MATERIALS
Volume 33, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202004305
Keywords
heterostructure; hexagonal boron nitride; hyperbolic phonon polaritons; silicon waveguide
Categories
Funding
- Office of Naval Research [N00014-18-1-2107]
- Vanderbilt University
- National Science Foundation [DMR1904793, ECCS1809937]
- Programmable Quantum Materials, an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0019443]
- Materials Engineering and Processing program of the National Science Foundation [CMMI 1538127]
- [ONR-N000014-18-1-2722]
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The study demonstrates that a hexagonal boron nitride (hBN)/silicon hybrid waveguide can enable dual-band operation at both mid-infrared and telecom frequencies without the need for deleterious etching. Integrating hyperbolic media with silicon photonics enables frequency multiplexing in on-chip photonic systems.
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 will 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. This paper demonstrates that a hexagonal boron nitride (hBN)/silicon hybrid waveguide can simultaneously enable dual-band operation at both mid-infrared (6.5-7.0 mu m) and telecom (1.55 mu m) frequencies, respectively. The device is realized via the lithography-free transfer of hBN onto a silicon waveguide, maintaining near-infrared operation. In addition, mid-infrared waveguiding of the hyperbolic phonon polaritons (HPhPs) supported in hBN is induced by the index contrast between the silicon waveguide and the surrounding air underneath the hBN, thereby eliminating the need for deleterious etching of the hyperbolic medium. The behavior of HPhP waveguiding in both straight and curved trajectories is validated within an analytical waveguide theoretical framework. This exemplifies a generalizable approach based on integrating hyperbolic media with silicon photonics for realizing frequency multiplexing in on-chip photonic systems.
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