A dual functional asymmetric plasmonic silver nanostructure for temperature and magnetic field sensing.

Many diverse technological applications, such as soft robotics and flexible electronics, demand the development of intelligent sensors that can simultaneously detect different physical parameters. Taking advantage of plasmonic structures, which can experience minute variations in physical parameters upon close contact, herein, a dual channel based silver nanostructure of concentric square rings and disks on an SiO substrate is proposed for the synchronized detection of magnetic field () and temperature (). The thermometric polydimethylsiloxane (PDMS) and ferromagnetic FeO were placed in two channels of the nanostructure, forming the sensor.

Flat-band localization and self-collimation of light in photonic crystals.

We investigate the optical properties of a photonic crystal (PC) composed of a quasi-one-dimensional flat-band lattice array through finite-difference time-domain simulations. The photonic bands contain flat bands (FBs) at specific frequencies, which correspond to compact localized states as a consequence of destructive interference. The FBs are shown to be nondispersive along the Г → X line, prohibiting optical transmission with incident light in x direction.

Unconventional Flatband Line States in Photonic Lieb Lattices.

Flatband systems typically host "compact localized states" (CLS) due to destructive interference and macroscopic degeneracy of Bloch wave functions associated with a dispersionless energy band. Using a photonic Lieb lattice (LL), such conventional localized flatband states are found to be inherently incomplete, with the missing modes manifested as extended line states that form noncontractible loops winding around the entire lattice. Experimentally, we develop a continuous-wave laser writing technique to establish a finite-sized photonic LL with specially tailored boundaries and, thereby, directly observe the unusually extended flatband line states.