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Vibrational Coupling to Epsilon-Near-Zero Waveguide Modes by Folland, Thomas G.; Lu, Guanyu; Bruncz, Autumn; Nolen, Joshua Ryan; Tadjer, Marko J.; Caldwell, Joshua D is a Engineering article available to read on EtoBox.

What is Vibrational Coupling to Epsilon-Near-Zero Waveguide Modes about?

Epsilon near zero modes offer extreme field enhancement that can be 2 utilized for developing enhanced sensing schemes. However, demonstrations of 3 enhanced spectroscopies have largely exploited surface polaritons, mostly due to the 4 challenges of coupling a vibrational transition to volume-confined epsilon near zero 5 modes. Here we fabricate high aspect ratio gratings (up to 24.8 μm height with greater 6 than 5 μm pitch) of 4H-SiC, with resonant modes that couple to transverse magnetic and 7 transverse electric incident fields. These correspond to metal-insulator-metal waveguide 8 modes propagating downwards into the substrate. The cavity formed by the finite length 9 of the waveguide allows for strong absorption of incident infrared light (>80%) with Q 10 factors in excess of 90, including an epsilon near zero waveguide mode with 11 ε eff =0.0574+0.008i. The localization of the electromagnetic fields within the gap between 12 the grating teeth suggests an opportunity to realize a new platform for studying vibrational 13 coupling in liquid environments, with potential opportunities for enhanced spectroscopies. 14 We show that these modes are supported in anhydrous and aqueous e

Who reads Vibrational Coupling to Epsilon-Near-Zero Waveguide Modes?

Author

Folland, Thomas G.; Lu, Guanyu; Bruncz, Autumn; Nolen, Joshua Ryan; Tadjer, Marko J.; Caldwell, Joshua D

Publisher

American Chemical Society; American Chemical Society (ACS) (ISSN 2330-4022)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)