6 research outputs found
Lead Halide Perovskite Nanoribbon Based Uniform Nanolaser Array on Plasmonic Grating
It
has been a long-term dream to achieve nanolaser array with uniform
laser wavelengths, high densities, and high output powers. However,
such kind of nanolaser array is practically quite challenging due
to the variations of both bottom-up synthesized nanostructures and
top-down etched devices. Herein we explore a simple method to achieve
such kind of uniform nanolaser array. By placing a single crystalline
CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> nanoribbon onto a gold
grating, both of our numerical calculation and experimental results
show that the light can be well trapped by a waveguide mode around
the air slot area, providing the possibility of high power nanolaser
in a narrow air slot. The smallest size of the gap for light confinement
is optimized to around 350–400 nm. Consequently, a high-density,
uniform nanolaser array has been experimentally realized. And the
coupling between different subunits is found to be negligibly small.
We believe that this research can boost the progresses of nanolaser
array and the corresponding practical applications such as pinpoint
detection
All-Dielectric Full-Color Printing with TiO<sub>2</sub> Metasurfaces
Recently,
color generation in resonant nanostructures have been
intensively studied. Despite of their exciting progresses, the structural
colors are usually generated by the plasmonic resonances of metallic
nanoparticles. Due to the inherent plasmon damping, such plasmonic
nanostructures are usually hard to create very distinct color impressions.
Here we utilize the concept of metasurfaces to produce all-dielectric,
low-loss, and high-resolution structural colors. We have fabricated
TiO<sub>2</sub> metasurfaces with electron-beam lithography and a
very simple lift-off process. The optical characterizations showed
that the TiO<sub>2</sub> metasurfaces with different unit sizes could
generate high reflection peaks at designed wavelengths. The maximal
reflectance was as high as 64% with full width at half-maximum (fwhm)
around 30 nm. Consequently, distinct colors have been observed in
bright field and the generated colors covered the entire visible spectral
range. The detailed numerical analysis shows that the distinct colors
were generated by the electric resonance and magnetic resonances in
TiO<sub>2</sub> metasurfaces. Based on the unique properties of magnetic
resonances, distinct colors have been observed in bright field when
the metasurfaces were reduced to a 4 × 4 array, giving a spatial
resolution around 16000 dpi. Considering the cost, stability, and
CMOS-compatibility, this research will be important for the structural
colors to reach real-world industrial applications
Real-Time Tunable Colors from Microfluidic Reconfigurable All-Dielectric Metasurfaces
Structural
colors arising from all-dielectric nanostructures are
very promising for high-resolution color nanoprinting and high-density
optical storage. However, once the all-dielectric nanostructures are
fabricated, their optical performances are usually static or change
slowly, significantly limiting the practical applications in advanced
displays. Herein, we experimentally demonstrate the real-time tunable
colors with microfluidic reconfigurable all-dielectric metasurfaces.
The metasurface is composed of an array of TiO<sub>2</sub> nanoblocks,
which are embedded in a polymeric microfluidic channel. By injecting
solutions with a different refractive index into the channel, the
narrow band reflection peak and the corresponding distinct colors
of a TiO<sub>2</sub> metasurface can be precisely controlled. The
transition time is as small as 16 ms, which is orders of magnitude
faster than the current techniques. By varying the lattice size of
TiO<sub>2</sub> metasurfaces, the real-time tunable colors are able
to span the entire visible spectrum. Meanwhile, the injection and
ejection of solvent have also shown the capability of the erasion
and the restoration of information encoded in TiO<sub>2</sub> metasurfaces.
The combination of all-dielectric nanostructures with microfluidic
channels shall boost their applications in functional color display,
banknote security, anticounterfeiting, and point-of-care devices
Real-Time Tunable Colors from Microfluidic Reconfigurable All-Dielectric Metasurfaces
Structural
colors arising from all-dielectric nanostructures are
very promising for high-resolution color nanoprinting and high-density
optical storage. However, once the all-dielectric nanostructures are
fabricated, their optical performances are usually static or change
slowly, significantly limiting the practical applications in advanced
displays. Herein, we experimentally demonstrate the real-time tunable
colors with microfluidic reconfigurable all-dielectric metasurfaces.
The metasurface is composed of an array of TiO<sub>2</sub> nanoblocks,
which are embedded in a polymeric microfluidic channel. By injecting
solutions with a different refractive index into the channel, the
narrow band reflection peak and the corresponding distinct colors
of a TiO<sub>2</sub> metasurface can be precisely controlled. The
transition time is as small as 16 ms, which is orders of magnitude
faster than the current techniques. By varying the lattice size of
TiO<sub>2</sub> metasurfaces, the real-time tunable colors are able
to span the entire visible spectrum. Meanwhile, the injection and
ejection of solvent have also shown the capability of the erasion
and the restoration of information encoded in TiO<sub>2</sub> metasurfaces.
The combination of all-dielectric nanostructures with microfluidic
channels shall boost their applications in functional color display,
banknote security, anticounterfeiting, and point-of-care devices
Real-Time Tunable Colors from Microfluidic Reconfigurable All-Dielectric Metasurfaces
Structural
colors arising from all-dielectric nanostructures are
very promising for high-resolution color nanoprinting and high-density
optical storage. However, once the all-dielectric nanostructures are
fabricated, their optical performances are usually static or change
slowly, significantly limiting the practical applications in advanced
displays. Herein, we experimentally demonstrate the real-time tunable
colors with microfluidic reconfigurable all-dielectric metasurfaces.
The metasurface is composed of an array of TiO<sub>2</sub> nanoblocks,
which are embedded in a polymeric microfluidic channel. By injecting
solutions with a different refractive index into the channel, the
narrow band reflection peak and the corresponding distinct colors
of a TiO<sub>2</sub> metasurface can be precisely controlled. The
transition time is as small as 16 ms, which is orders of magnitude
faster than the current techniques. By varying the lattice size of
TiO<sub>2</sub> metasurfaces, the real-time tunable colors are able
to span the entire visible spectrum. Meanwhile, the injection and
ejection of solvent have also shown the capability of the erasion
and the restoration of information encoded in TiO<sub>2</sub> metasurfaces.
The combination of all-dielectric nanostructures with microfluidic
channels shall boost their applications in functional color display,
banknote security, anticounterfeiting, and point-of-care devices
Real-Time Tunable Colors from Microfluidic Reconfigurable All-Dielectric Metasurfaces
Structural
colors arising from all-dielectric nanostructures are
very promising for high-resolution color nanoprinting and high-density
optical storage. However, once the all-dielectric nanostructures are
fabricated, their optical performances are usually static or change
slowly, significantly limiting the practical applications in advanced
displays. Herein, we experimentally demonstrate the real-time tunable
colors with microfluidic reconfigurable all-dielectric metasurfaces.
The metasurface is composed of an array of TiO<sub>2</sub> nanoblocks,
which are embedded in a polymeric microfluidic channel. By injecting
solutions with a different refractive index into the channel, the
narrow band reflection peak and the corresponding distinct colors
of a TiO<sub>2</sub> metasurface can be precisely controlled. The
transition time is as small as 16 ms, which is orders of magnitude
faster than the current techniques. By varying the lattice size of
TiO<sub>2</sub> metasurfaces, the real-time tunable colors are able
to span the entire visible spectrum. Meanwhile, the injection and
ejection of solvent have also shown the capability of the erasion
and the restoration of information encoded in TiO<sub>2</sub> metasurfaces.
The combination of all-dielectric nanostructures with microfluidic
channels shall boost their applications in functional color display,
banknote security, anticounterfeiting, and point-of-care devices