We explore the excitation of plasmons in 3D plasmon crystal metamaterials and report the observation of a delocalized plasmon mode, which provides extremely high spectral sensitivity (>2600 nm per refractive index unit (RIU) change), outperforming all plasmonic counterparts excited in 2D nanoscale geometries, as well as a prominent phase-sensitive response (>3*104 deg. of phase per RIU). Combined with a large surface for bioimmobilization provided by the 3D matrix, the proposed sensor architecture promises a new important landmark in the advancement of plasmonic biosensing technology.
A three-dimensional (3D) holographic focal volume engineering method is proposed and employed for advanced multiphoton polymerization. A large number of foci are closely positioned in space according to a designed geometry, avoiding undesired interference effects by phase engineering. Through all-optical micro-displacements in space, the discrete foci bundle leads to the realization of complete 3D arbitrary structures. The microstructures are fabricated by direct laser writing without additional optical or mechanical motion support. We report a 20-times faster fabrication time in comparison to point-by-point laser polymerization techniques.
geometries ensure large surface area interaction of photonic devices with the surrounding medium. Here, we demonstrate that metamaterials composed of 3D metallic Split Cube Resonator (SCR) elements assembled in various arrangements enable resonantly enhanced refractive index sensing. The proper arrangement of the SCR elements results in almost perfect narrow-band direction-selective absorption, which is highly sensitive to the refractive index of the surrounding environment. The experimental sensitivity achieved exceeds 5.5 μm per Refractive Index Unit (RIU) with theoretical predictions showing that this can reach 11 μm/RIU. The structures allow easy fabrication via direct laser writing and highly selective electroless metal plating. Thus, the proposed metadevices are ideal candidates for assisting cost-effective infrared polarization-resolved sensing and direction-selective spectral filtering in and out of the infrared atmospheric transparency window.
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