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These articles were highlighted on the covers of the Advanced Optical Materials March issue:
Microrings are prepared lithographically by M. Hirtz, W. H. P. Pernice, and co-workers from diamond thin films, then coupled to photonic bus waveguides for on-chip readout. Each ring can be painted with an individual color by employing multi-cantilever probes. Site-specific functionalization on arbitrary geometrical features is possible with sub-100 nm linewidths for several photonic devices simultaneously.
An etched, doped, silicon wafer forming an array of crosses exhibits near-perfect absorption in the terahertz spectral range. W. Withayachumnankul, S. Sriram, and co-workers show how a bandwidth of 90% is enabled by two low-Q resonance modes supported by plasmonic cavities. Such efficient broadband absorption will enhance imaging and communications applications at terahertz frequencies.
Nanoplasmonic, volumetric, self-organized, silver-based eutectics exhibit localized surface plasmon resonances (LSPRs) at visible wavelengths after annealing. K. Sadecka, D. A. Pawlak, and co-workers demonstrate how, in transmitted light, the sample shows a blue coloration: the complementary wavelength to the yellow light absorbed due to the LSPR at about 590 nm.