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High-refractive-index 2D photonic structures for robust low-threshold multiband lasing.
Nanoscale Horiz
January 2025
Institute of Materials Science of Barcelona (ICMAB-CSIC), Campus de la UAB, 08193, Bellaterra, Spain.
High-refractive-index (HRI) dielectrics are gaining increasing attention as building blocks for compact lasers. Their ability to simultaneously support both electric and magnetic modes provides greater versatility as compared to plasmonic platforms. Moreover, their reduced absorption loss minimizes heat generation, further enhancing their performance.
View Article and Find Full Text PDFDesign and Fabrication of Ultrathin Metallic Phase Shifters for Visible and Near-Infrared Wavelengths.
Micromachines (Basel)
January 2025
State Key Laboratory of High-Performance Precision Manufacturing, Dalian University of Technology, Dalian 116024, China.
The polarization state of light is critical for biological imaging, acousto-optics, bio-navigation, and many other optical applications. Phase shifters are extensively researched for their applications in optics. The size of optical elements with phase delay that are made from natural birefringent materials is limited; however, fabricating waveplates from dielectric metamaterials is very complex and expensive.
View Article and Find Full Text PDFHigh-Uniformity, Shape-Controlled Silicon Nanowires for Enhanced Performance in Optoelectronic Devices.
Small Methods
January 2025
School of Electrical and Electronic Engineering Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
Silicon nanowires (Si NWs) have attracted considerable interest owing to their distinctive properties, which render them promising candidates for a wide range of advanced applications in electronics, photonics, energy storage, and sensing. However, challenges in achieving large-scale production, high uniformity, and shape control limit their practical use. This study presents a novel fabrication approach combining nanoimprint lithography, nanotransfer printing, and metal-assisted chemical etching to produce highly uniform and shape-controlled Si NW arrays.
View Article and Find Full Text PDFFabrication of nanoparticles with precisely controllable plasmonic properties as tools for biomedical applications.
Nanoscale
January 2025
AIT Austrian Institute of Technology, Molecular Diagnostics, 1210 Vienna, Austria.
Metal nanoparticles are established tools for biomedical applications due to their unique optical properties, primarily attributed to localized surface plasmon resonances. They show distinct optical characteristics, such as high extinction cross-sections and resonances at specific wavelengths, which are tunable across the wavelength spectrum by modifying the nanoparticle geometry. These attributes make metal nanoparticles highly valuable for sensing and imaging in biology and medicine.
View Article and Find Full Text PDFInverted Pyramid Nanostructures Coupled with a Sandwich Immunoassay for SERS Biomarker Detection.
Nanomaterials (Basel)
January 2025
Department of Photonics, National Cheng Kung University, Tainan 70101, Taiwan.
Cancer diagnostics often faces challenges, such as invasiveness, high costs, and limited sensitivity for early detection, emphasizing the need for improved approaches. We present a surface-enhanced Raman scattering (SERS)-based platform leveraging inverted pyramid SU-8 nanostructured substrates fabricated via nanoimprint lithography. These substrates, characterized by sharp apices and edges, are further functionalized with (3-aminopropyl)triethoxysilane (APTES), enabling the uniform self-assembly of AuNPs to create a highly favorable configuration for enhanced SERS analysis.
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