2 research outputs found
High-Performance Plasmonic Nanolasers with a Nanotrench Defect Cavity for Sensing Applications
Recent developments
in small footprint plasmonic nanolasers show
promise for active optical sensing with potential applications in
various fields, including real-time and label-free biochemical sensing,
and gas detection. In this study, we demonstrate a novel hybrid plasmonic
crystal nanolaser that features a ZnO nanowire placed on Al grating
surfaces with a nanotrench defect nanocavity. The lasing action of
gain-assisted defect nanocavity overcomes the ohmic loss parasitically
in the plasmonic nanostructures. Therefore, the plasmonic nanolaser
exhibits an extremely small mode volume, a narrow linewidth Δλ,
and a high Purcell factor that can facilitate the strong interaction
between light and matter. This can be used as a refractive index sensor
and is highly sensitive to local changes in the refractive indices
of ambient materials. By careful design, the near-ultraviolet nanolaser
sensors have significant sensing performances of glucose solutions,
revealing a high sensitivity of 249 nm/RIU and high resolution, with
a figure of merit of 1132, at the resonant wavelength of 373 nm
Ultracompact Pseudowedge Plasmonic Lasers and Laser Arrays
Concentrating
light at the deep subwavelength scale by utilizing
plasmonic effects has been reported in various optoelectronic devices
with intriguing phenomena and functionality. Plasmonic waveguides
with a planar structure exhibit a two-dimensional degree of freedom
for the surface plasmon; the degree of freedom can be further reduced
by utilizing metallic nanostructures or nanoparticles for surface
plasmon resonance. Reduction leads to different lightwave confinement
capabilities, which can be utilized to construct plasmonic nanolaser
cavities. However, most theoretical and experimental research efforts
have focused on planar surface plasmon polariton (SPP) nanolasers.
In this study, we combined nanometallic structures intersecting with
ZnO nanowires and realized the first laser emission based on pseudowedge
SPP waveguides. Relative to current plasmonic nanolasers, the pseudowedge
plasmonic lasers reported in our study exhibit extremely small mode
volumes, high group indices, high spontaneous emission factors, and
high Purell factors beneficial for the strong interaction between
light and matter. Furthermore, we demonstrated that compact plasmonic
laser arrays can be constructed, which could benefit integrated plasmonic
circuits