Dr. Swathi Iyer Profile

Dr. Swathi Iyer

at US Naval Research Lab

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Proceedings Article | 21 February 2019 Presentation + Paper

3D-printed infrared metamaterials

N. Sharac, G. R. Iyer, J. Tischler

Proceedings Volume 10926, 109261Q (2019) https://doi.org/10.1117/12.2510994

KEYWORDS: Etching, Dielectrics, Silicon carbide, Silicon, Reactive ion etching, Scanning electron microscopy, Electron beam lithography, Photoresist materials, Phonons, Atomic force microscopy, 3D printing

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Dielectric and semiconductor structures at the nanoscale are increasingly being applied in nanophotonic applications such as enhanced sensing, magnetic field enhancements, and metasurfaces. In contrast to their traditional metal plasmon counterparts -- such as Au and Ag -- dielectric materials benefit from low losses and CMOS compatibility. Here we explore of 3D dielectric structures on the nanometer and micron scales via a new patterning method, which employs both 3D, direct laser write (DLW) and reactive ion etching (RIE). Polymer structures, which are controlled down to the submicron scale both laterally and in height are printed using DLW onto various dielectric materials and are sub sequentially, etched using RIE. By tuning the etch ratio of the dielectric and polymer, the 3D printed pattern is transferred into the dielectric. By patterning a range of different 3D geometries onto Si, SiC, and hBN, we show that this method is applicable to a range of dielectric and semiconductor materials and to a range of different microstructures and nanostructures. Further, we show the possibility of selectively removing the polymer mask without damaging the underlying dielectric material, which enables the possibility of additional fabrication methods, such as for etching thin films.

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