Solar energy conversion to green energy production via solar water splitting, imitates photoinduced charge transfer into water or an electrolyte using a photoelectrode. Bandgap limitation affects common semiconductors used as photoelectrodes. From that perspective, interband and nonradiative decay of plasmon resonance facilitates a plasmonic phenomenon with a more comprehensive spectrum performance. This work systematically studies photoelectrochemical current generation using plasmonic Gold Nanoparticles (GNPs) organized in a one-dimensional lattice. Such arrangement of plasmonic GNPs produced photonic effects such as guided mode resonance and grating-coupled surface plasmon resonance, which contributed to superior photoelectrochemical current production than metal bar grating, and random gold nanoparticles. Additionally, a semiconductor layer was deposited over the grating of plasmonic particles to enhance plasmonic charge collection and current generation and extended the UV-limited semiconductor's PEC spectral response bolstered by multiphotonic-plasmonic resonance phenomena. Our research offers a derived approach to enable light harvesting mechanisms for the production of green energy.
Quantitative Phase Imaging (QPI) enables non-destructive, real-time, label-free imaging of transparent specimens and can reveal information about their fundamental properties such as cell size and morphology, mass density, particle dynamics, and cellular fluctuations. Development of high-performance and low-cost quantitative phase imaging systems is thus required in many fields, including for on-site biomedical imaging and industrial inspection. Here, we propose an ultra-compact, highly stable interferometer based on a single-layer dielectric metasurface for common path off-axis digital holography, and experimentally demonstrate quantitative phase imaging. The interferometric imaging system leveraging an ultrathin multifunctional metasurface captures image plane holograms in a single shot and provides quantitative phase information of the test samples for extraction of its physical properties. With the benefits of planar engineering and high integrability, the proposed metasurface-based method establishes a stable miniaturized QPI system for reliable and cost-effective point-of-care devices, live cell imaging, three-dimensional topography, and edge detection for optical computing.
Solar energy is a clean and renewable energy source that solves energy and climate emergencies. The near-perfect broadband solar absorbers can offer necessary technical assistance to follow this route and develop an effective solar energy-harvesting system. This work designed a metamaterial perfect absorber that operates in the ultraviolet to near-infrared spectral range. It is made up of titanium (Ti) parabolic nanoarrays with a hexagonal lattice structure. By using the commercially available 3D-electromagnetic simulator (Lumerical FDTD) operating in the finite-difference time-domain approach, we have found the strong absorption (⪆ 90%) of the absorber across the broadband range of the wavelength 200–3000 nm. Furthermore, we observed that increasing the height of nano-pillars can lead to an expansion in the bandwidth of the absorber. Our study highlights the significant roles played by the localized surface plasmon resonances of Ti parabolic nanoarrays, the inherent loss of titanium material, and the coupling of resonance modes between adjacent parabolic nanoarrays in facilitating this broadband perfect absorption phenomenon. Additionally, we demonstrate that the absorber exhibits some excellent features desirable for the practical absorption and harvesting of solar energy, such as precision tolerance, polarization independence, and large angular acceptance.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.