Multiple coupling in plasmonic metal/dielectric hollow nanocavity arrays for highly sensitive detection

Abstract

Recently, the plasmonic coupled optical cavity has gained much attention due to its attractive properties in light manipulation, e.g. high Q optical resonance, local field enhancements and extraordinary transmission. The strongly enhanced local field originated from the plasmonic resonance hybridizing with the optical cavity mode presents great potential for application to chemical and biological sensing. Here, the multiple coupling effect between plasmonic mode and optical cavity mode has been demonstrated in self-assembled metal/dielectric hollow-nanosphere (HNS) arrays and the strongly enhanced local field originated from the inter-coupling of the plasmonic cavities was further employed for highly sensitive recyclable SERS sensing.

Purcell factor based understanding of enhancements in surface plasmon-coupled emission with DNA architectures

“…Plasmonic nanocavities formed between two high dielectric constant materials have shown augmented fluorescence. 10 In line with this we observed 14-fold and 58-fold emission enhancements in the SPCE region (Fig. 1 right).…”

High-Performance Real-Time SERS Detection with Recyclable Ag Nanorods@HfO2 Substrates

“…Moreover, Ar + plasma treatment has been utilized to clean gold nanowire forests after SERS sensing, thereby illustrating the morphological stability and renewability of Au substrates. Reusability has become an important evaluation index for the usefulness of SERS detection systems and is likely to promote the development of SERS technique as a routine analytical tool in many applications. , However, most cleaning approaches are complicated, which require expensive apparatus and specific operations (e.g., ultraviolet irradiation, magnet separation, or plasma treatment), and usually consume much time (from several minutes to several hours). As a consequence, it is meaningful to clean and regenerate SERS substrates in more convenient and efficient manners.…”

Synergetic SERS Enhancement in a Metal-Like/Metal Double-Shell Structure for Sensitive and Stable Application

“…As expected, the multiple-mode resonances (i.e., dipole, quadrupole, octupole, and hexadecapole) were revealed in the only Ag HNS arrays, which is consistent with previous reports. 26,29 When a thin layer of TiN with a thickness of either 5 or 10 nm was introduced around Ag HNSs, a red shift in frequencies and a higher intensity of the corresponding resonance modes were identified in both extinction spectra. 25 Reasonably, these changes can be attributed to the size increment after introducing the TiN layer.…”