AI Article Synopsis
- The Fresnel theory indicates that reflectivity of convex surfaces is higher at the edges than at the center, making the enhancement of center reflectance an important study for optical gain.
- A composite of PDMS-encapsulated cylindrical non-closed-packed photonic crystals has been designed to improve spectral selectivity and increase optical gain, allowing for high reflection in certain light bands.
- This new photonic crystal composite offers a breakthrough by overcoming the limitations of traditional Fresnel mirrors, with applications in signal transmission, optical measurement, and instrument design.
Article Abstract
According to the Fresnel theory, the reflectivity intensity of spherical and cylindrical convex surfaces decreases from their edge to center, and it is noteworthy and interesting for optical gain to study the enhancement of center reflectance. In this paper, a polydimethylsiloxane (PDMS) - encapsulated cylindrical non-closed-packed photonic crystals (NPCs) composite with Bragg-enhanced Fresnel reflectance was designed for spectral selectivity and optical gain. Theoretically and experimentally, the periodically ordered structure of NPCs achieved high-reflection of light in photonic bandgap and high-transmission in other bands, which enhanced Fresnel reflectivity of the convex center to specific bands. Furtherly, the cylindrical NPCs hydrogel with stretchability was applied for the dynamic tuning of optical signals. The reflection peak of the PDMS-encapsulated cylindrical NPCs composite blue-shifted from 608 nm to 413 nm with 50 % tensile strain and achieved a rapid transition of structural color from orange to blue-violet in 60 cycles. The new kind of photonic crystals composite for optical gain and spectral selection broke through the limitations of traditional Fresnel curved mirrors with the lowest central reflectivity and inability to perform spectral selectivity, and have great significance and application prospects in fields of signal transmission, optical measurement, and instrument design.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jcis.2024.04.051 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Foveal Avascular Zone development by OCTA: weighing the influence of Gestational Age and neonatal early growth independently of Retinopathy of Prematurity.
Retina
December 2024
Pediatrics Department. Alvaro Cunqueiro University Hospital, 36313 Vigo, Spain. Galicia Sur Health Research Institute.
Purpose: Focusing the premature birth and its potential complications, this study analyzes Foveal Avascular Zone (FAZ) measured by Optical Coherence Tomography Angiography (OCTA) and its correlation with the severity of prematurity and neonatal growth.
Methods: A cross-sectional comparative study was performed, involving 71 children school-age with history of prematurity and a full-term children control group. Several variables from the neonatal period were collected, such as Gestational Age (GA), Birth Weight (BW), initial Weight Gain (WG) and Retinopathy of Prematurity (ROP).
Nitric oxide modulates contrast suppression in a subset of mouse retinal ganglion cells.
Elife
January 2025
Werner Reichardt Centre for Integrative Neuroscience, University of Tübingen, Tübingen, Germany.
Neuromodulators have major influences on the regulation of neural circuit activity across the nervous system. Nitric oxide (NO) has been shown to be a prominent neuromodulator in many circuits and has been extensively studied in the retina. Here, it has been associated with the regulation of light adaptation, gain control, and gap junctional coupling, but its effect on the retinal output, specifically on the different types of retinal ganglion cells (RGCs), is still poorly understood.
View Article and Find Full Text PDFEarly detection of carcinoma: correlating quantifiable tumor biomarkers with high-resolution microscopy (HRME) findings.
Expert Rev Mol Diagn
January 2025
Department of Electronics and Communication Engineering, IIITDM Kancheepuram, Chennai, India.
Introduction: Cancer ranks as the second most prevalent cause of death worldwide, responsible for approximately 9.6 million deaths annually. Approximately one out of every six deaths is caused by cancer.
View Article and Find Full Text PDFA color-coordinated approach to the flow synthesis of silver nanoparticles with custom morphologies.
Nanoscale Adv
December 2024
Department of Chemistry and Biomolecular Sciences, University of Ottawa Ottawa Ontario K1N 6N5 Canada
In an effort to meet the high demand for silver nanostructures in both research and consumer applications, we devise a simple and readily scaleable photochemical method through which silver nanostructures of varying morphologies, sizes, and optical properties can be synthesized using batch and flow photochemical strategies. For the latter we build upon the application of a wrapped-lamp photochemical flow system recently developed by our group to enable sequential irradiation with several wavelengths of LEDs in series in an approach that we describe as "plasmon pushing". We find that this strategy can accelerate the conversion of silver nanoparticle seeds to decahedral and triangular nanostructures, and that with it we have control over the tuning of the size and optical properties of triangular nanostructures in the red and near-IR regions.
View Article and Find Full Text PDFMechanosensitive stacking structure with continuous solar controllability for real-time thermal management.
Mater Horiz
January 2025
State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan 430200, China.
Adaptive control of solar light based on an optical switching strategy is essential to tune thermal gain, while real-time solar regulation and hence on-demand thermal management coupled with dynamic conditions still faces a formidable challenge. Herein, we develop a stacking structure which is mechanosensitive and can be finely tuned depending on the dynamic cavitation effect. Specifically, the stacking structure transfers from a solid monolith state to porous layered state progressively under mechanical stretching, and the resulting porous layered state gradually goes back to the solid monolith state once the load is released.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!