Accessible, All-Polymer Metasurfaces: Low Effort, High Quality Factor

Abstract

Optical metasurfaces supporting resonances with high quality factors offer an outstanding platform for applications such as non-linear optics, light guiding, lasing, sensing, light-matter coupling, and quantum optics. However, their experimental realization typically demands elaborate multi-step procedures such as metal or dielectric deposition, lift-off, and reactive ion etching. As a consequence, accessibility, large-scale production and sustainability are constrained by reliance on cost-, time- and labor-intensive facilities. We overcome this fabrication hurdle by repurposing polymethyl methacrylate-which is usually employed as a temporary resist-as the resonator material, thereby eliminating all steps except for spin-coating, exposure and development. Because the low refractive index of the polymer limits effective mode formation, we present a bilayer recipe that enables the convenient fabrication of a freestanding membrane to maximize the index contrast with its surroundings. Since etching induced defects are circumvented, the membrane features high quality nanopatterns. We further examine the suspended membrane with scanning electron microscopy and extract its position-dependent spring constant and pretension with nanoindentation experiments applied by the tip of an atomic force microscope. Our all-polymer metasurface hosting Bound States in the Continuum experimentally delivers high quality factors (up to 523) at visible and near infrared wavelengths, despite the low refractive index of the polymer, and enables straightforward geometry-based tuning of both linewidth and resonance position. We envision this methodology to lay the groundwork for accessible, high performance metasurfaces with unique use cases such as material blending, angled writing and mechanically based resonance tuning.

28 pages, 1 TOC figure, 4 figures, and 5 supporting figures

References in corpus (14)

• Dielectric Metasurfaces for Complete Control of Phase and Polarization with Subwavelength Spatial Resolution and High Transmission
• Asymmetric metasurfaces with high-$Q$ resonances governed by bound states in the continuum
• Resonantly Trapped Bound State in the Continuum Laser
• Mid-Infrared Plasmonic Biosensing with Graphene
• Topological nature of bound states in the radiation continuum
• Elastic properties of freely suspended MoS2 nanosheets
• Mode-matching in multiresonant plasmonic nanoantennas for enhanced second harmonic generation
• Metasurfaces for Quantum Photonics
• Multipolar origin of bound states in the continuum
• Coherent perfect absorption in deeply subwavelength films in the single photon regime
• Dielectric nano-antennas for strain engineering in atomically thin two-dimensional semiconductors
• Chiral electroluminescence from thin-film perovskite metacavities
• Optically addressable spin defects coupled to bound states in the continuum metasurfaces
• Highly directional and coherent emission from dark excitons enabled by bound states in the continuum