SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 52: Poster Session IV: Poster to Mini-Symposium: Infrared nano-optics II
O 52.2: Poster
Dienstag, 2. März 2021, 13:30–15:30, P
Vibrational Coupling to Epsilon-Near-Zero Waveguide Modes — •Thomas G Folland1, Guanyu Lu2, Autumn Bruncz2,3, J. Ryan Nolen2, Marko Tadjer4, and Joshua D Caldwell2 — 1School of Physics and Astronomy, The University of Iowa, Iowa City, Iowa, USA, 52242 — 2Department of Mechanical Engineering, Vanderbilt University, Nashville, Tennessee 37212, United States — 3Department of Physics, University of Alabama in Huntsville, Huntsville, Alabama 35899, United States — 4U.S. Naval Research Laboratory, Washington, D.C. 20375, United States
Epsilon near zero modes offer extreme field enhancement that can be utilized for developing enhanced sensing schemes. Here we fabricate high aspect ratio gratings (up to 24.8 um height with greater than 5 um pitch) of 4H-SiC, with resonant modes that couple to transverse magnetic and transverse electric incident fields. These correspond to metal insulator metal waveguide modes propagating downward into the substrate. The cavity formed by the finite length of the waveguide allows for strong absorption of incident infrared light (>80%) with Q factors in excess of 90, including an epsilon near zero waveguide mode with epsilon = 0.0574 + 0.008i. The localization of the electromagnetic fields within the gap between the grating teeth suggests an opportunity to realize a new platform for studying vibrational coupling in liquid environments, with potential opportunities for enhanced spectroscopies. We show that these modes are supported in anhydrous and aqueous environments and that high aspect ratio gratings coherently couple to the vibrational transition in the surrounding liquid.