Journal
ACS PHOTONICS
Volume 6, Issue 12, Pages 3225-3232Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.9b01094
Keywords
hexagonal boron nitride (h-BN); phononic crystal waveguide; acoustic wave; nanoelectromechanical systems (NEMS); radio frequency (RE); integrated phononics
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Funding
- National Science Foundation (NSF) via EFRI ACQUIRE program [EFMA 1641099]
- NSF CAREER Award [ECCS 1454570]
- Research Experience and Mentoring (REM) program
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Hexagonal boron nitride (h-BN), one of the hallmark van der Waals (vdW) layered crystals with an ensemble of attractive physical properties, is playing increasingly important roles in exploring two-dimensional (2D) electronics, photonics, mechanics, and emerging quantum engineering. Here, we report on the demonstration of h-BN phononic crystal waveguides with designed pass and stop bands in the radio frequency (RF) range and controllable wave propagation and transmission, by harnessing arrays of coupled h-BN nanomechanical resonators with engineerable coupling strength. Experimental measurements validate that these phononic crystal waveguides confine and support 15-24 megahertz (MHz) wave propagation over 1.2 millimeters. Analogous to solid-state atomic crystal lattices, phononic bandgaps and dispersive behaviors have been observed and systematically investigated in the h-BN phononic waveguides. Guiding and manipulating acoustic waves on such additively integratable h-BN platform may facilitate multiphysical coupling and information transduction, and open up new opportunities for coherent on-chip signal processing and communication via emerging h-BN photonic and phononic devices.
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