We present phase-responding Fourier nanotransducers based on plasmonic metamaterials for ultrasensitive control of
dynamic characteristics of 2D materials and functional biosensing interfaces. These nanotransducers are designed in such
a way that they can confine light in 2D plane contacting with a probed ultrathin sample, gathering information about its
properties, and then transmitting the information into discrete optical beams with amplified phase relations. To demonstrate
their potential of Fourier transducers in biosensing, we designed Fourier nanotransducers based on periodic gold
nanostructures and applied it in a newly developed protocol for the detection of important antibiotic chloramphenicol
(CAP). Such biosensing tests showed the lower detection limit at fg mL−1 level, which several orders of magnitude better
than reported in the literature. The implementation of Fourier nanotransducers opens new opportunities for a radical
improvement of current state-of-the art plasmonic biosensing technology.
We investigate conditions of excitation and properties of Plasmonic Surface Lattice Resonances (PSLR) over glass substrate-supported Au nanoparticle dimers (~100-200 nm) arranged in a periodic metamaterial lattice, in Attenuated Total Reflection (ATR) optical excitation geometry, and assess their sensitivities to variations of refractive index (RI) of the adjacent sample dielectric medium. We show that spectral sensitivity of PSLR to RI variations is determined by the lattice periodicity (~ 320 nm per RIU change in our case), while ultranarrow resonance lineshapes (down to a few nm full-widthat-half-maximum) provide very high figure-of-merit values evidencing the possibility of ultrasensitive biosensing measurements. Combining advantages of nanoscale architectures, including a strong concentration of electric field, the possibility of manipulation at the nanoscale etc, and high phase and spectral sensitivities, PSLRs promise a drastic advancement of current state-of-the-art plasmonic biosensing technology.