3 research outputs found
Highly Sensitive, Label-Free Detection of 2,4-Dichlorophenoxyacetic Acid Using an Optofluidic Chip
A highly sensitive
approach for rapid and label-free detection
of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) using an optofluidic
chip is demonstrated. The optofluidic chip is prepared by covalent
immobilization of 2,4-D-bovine serum albumin (2,4-D-BSA) conjugate
to an integrated microring resonator. Subsequent detection of 2,4-D
carried out in a competitive immunoreaction format enables selective
detection of 2,4-D in different types of water samples, including
bottled, tap, and lake water, at a limit of detection (LOD) of 4.5
pg/mL and in a quantitative range of 15–10<sup>5</sup> pg/mL.
The microring resonator-based optofluidic chip is reusable with ultrahigh
sensitivity that offers real-time and on-site detection of low-molecular-weight
targets for potential applications in food safety and environmental
monitoring
High-Efficiency Broadband Meta-Hologram with Polarization-Controlled Dual Images
Holograms, the optical devices to
reconstruct predesigned images,
show many applications in our daily life. However, applications of
hologram are still limited by the constituent materials and therefore
their working range is trapped at a particular electromagnetic region.
In recent years, the metasurfaces, an array of subwavelength antenna
with varying sizes, show the abilities to manipulate the phase of
incident electromagnetic wave from visible to microwave frequencies.
Here, we present a reflective-type and high-efficiency meta-hologram
fabricated by metasurface for visible wavelength. Using gold cross
nanoantennas as building blocks to construct our meta-hologram devices
with thickness ∼ λ/4, the reconstructed images of meta-hologram
show polarization-controlled dual images with high contrast, functioning
for both coherent and incoherent light sources within a broad spectral
range and under a wide range of incidence angles. The flexibility
demonstrated here for our meta-hologram paves the road to a wide range
of applications related to holographic images at arbitrary electromagnetic
wave region
High-Efficiency Broadband Meta-Hologram with Polarization-Controlled Dual Images
Holograms, the optical devices to
reconstruct predesigned images,
show many applications in our daily life. However, applications of
hologram are still limited by the constituent materials and therefore
their working range is trapped at a particular electromagnetic region.
In recent years, the metasurfaces, an array of subwavelength antenna
with varying sizes, show the abilities to manipulate the phase of
incident electromagnetic wave from visible to microwave frequencies.
Here, we present a reflective-type and high-efficiency meta-hologram
fabricated by metasurface for visible wavelength. Using gold cross
nanoantennas as building blocks to construct our meta-hologram devices
with thickness ∼ λ/4, the reconstructed images of meta-hologram
show polarization-controlled dual images with high contrast, functioning
for both coherent and incoherent light sources within a broad spectral
range and under a wide range of incidence angles. The flexibility
demonstrated here for our meta-hologram paves the road to a wide range
of applications related to holographic images at arbitrary electromagnetic
wave region