Dual-band moiré metasurface patches for multifunctional biomedical applicationsElectronic supplementary information (ESI) available: Methods of experiments and simulations, schematic of the fabrication process, absorption spectra of the Au moiré metasurfaces and schematic of the patterning bacteria. See DOI: 10.1039/c6nr06608a

There has been strong interest in developing multi-band plasmonic metasurfaces for multiple optical functions on single platforms. Herein, we developed Au moiré metasurface patches (AMMP), which leverage the tunable multi-band responses of Au moiré metasurfaces and the additional field enhancements of the metal-insulator-metal configuration to achieve dual-band plasmon resonance modes in near-infrared and mid-infrared regimes with high field enhancement. Furthermore, we demonstrate the multifunctional applications of AMMP, including surface-enhanced infrared spectroscopy, optical capture and patterning of bacteria, and photothermal denaturation of proteins. With their multiple functions of high performance, in combination with cost-effective fabrication using moiré nanosphere lithography, the AMMP will enable the development of highly integrated biophotonic platforms for a wide range of applications in disease theranostics, sterilization, and the study of microbiomes. Dual-band Au moiré metasurface patches (AMMP) are developed for multiple biomedical applications, including SEIRS, sterilization, and denaturation.