Silk fibroin (SF), the primary protein in silkworm silk, has emerged as a promising organic nonlinear optical material due to its unique combination of optical transparency, biocompatibility, and environmental sustainability. In this study, we investigate the nonlinear optical properties of SF thin films using the -scan technique with femtosecond laser pulses (35 fs, 800 nm, 1 kHz). Our results reveal a strong self-defocusing effect (negative nonlinear refractive index) and significant multiphoton absorption, demonstrating SF's tunable nonlinear response. Additionally, optical transmittance measurements confirm SF's partial transparency in the deep UV region, enhancing its potential for second-harmonic generation (SHG) and efficient light frequency conversion. These findings address a key knowledge gap in nonlinear optics, positioning SF as a versatile biopolymer for advanced photonic applications.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.3390/ma18051052 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Cell-Type Specific Variation in X-Chromosome Dosage Compensation in Drosophila.
MicroPubl Biol
February 2025
Intramural Research Program, National Library of Medicine, National Institutes of Health, Bethesda, Maryland, United States.
Male require dosage compensation to equalize X-linked gene expression with autosomal expression. Leveraging the single-nucleus Fly Cell Atlas (FCA) dataset, which includes 388,918 nuclei across diverse tissues, we investigated cell-type-specific patterns of X-chromosome dosage compensation. Our analysis identified a continuum of cell groups based on their X-to-autosome (X/A) expression ratios ranging from anti-compensated to effectively compensated and overcompensated.
View Article and Find Full Text PDFInvestigation of the Nonlinear Optical Properties of Silk Fibroin (SF) Using the Z-Scan Method.
Materials (Basel)
February 2025
Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee, Blvd., 1784 Sofia, Bulgaria.
Silk fibroin (SF), the primary protein in silkworm silk, has emerged as a promising organic nonlinear optical material due to its unique combination of optical transparency, biocompatibility, and environmental sustainability. In this study, we investigate the nonlinear optical properties of SF thin films using the -scan technique with femtosecond laser pulses (35 fs, 800 nm, 1 kHz). Our results reveal a strong self-defocusing effect (negative nonlinear refractive index) and significant multiphoton absorption, demonstrating SF's tunable nonlinear response.
View Article and Find Full Text PDFDipolar Copper(I) Complexes: A Novel Appealing Class of Highly Active Second-Order NLO-Phores.
Molecules
February 2025
Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), Istituto di Scienze e Tecnologie Chimiche "Giulio Natta" SCITEC, Consiglio Nazionale delle Ricerche (CNR), Via Elce di Sotto 8, I-06213 Perugia, Italy.
The second-order nonlinear optical (NLO) properties of the known heteroleptic complex [Cu(1,10-phenanthroline)xantphos][PF] (complex ) and the related new complexes [Cu(5-NO-1,10-phenanthroline)xantphos][PF] and [Cu(5-NO-1,10-phenanthroline)(dppe)][PF] (dppe = 1,2-bis(diphenylphosphino)ethane) (complexes and ) were investigated in solution by the EFISH (Electric Field-Induced Second Harmonic generation) technique, working at a non-resonant wavelength of 1907 nm. It turned out that they are characterized by large μβ values (957-1100 × 10 esu), much higher than that of the Disperse Red One benchmark. Unexpectedly, the homoleptic complex [Cu(2-mesityl-1,10-phenanthroline)][PF] (complex ) shows a similar high second-order NLO response.
View Article and Find Full Text PDFA cross-sectional observational study of the association between biochemistry profiles and the risk of age-related macular degeneration.
Sci Rep
March 2025
The Shaanxi Eye Hospital, Xi'an People's Hospital (Xi'an Fourth Hospital), Xi'an, China.
This study aimed to explore the relationship between biochemical profiles and the risk of age-related macular degeneration (AMD) through a cross-sectional observational analysis. We examined data of U. S.
View Article and Find Full Text PDFAn ultra-broadband photonic-chip-based parametric amplifier.
Nature
March 2025
Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, Switzerland.
Optical amplification, crucial for modern communication, primarily relies on erbium-doped fibre amplifiers (EDFAs). Yet, EDFAs only cover a portion of the low-loss spectrum of optical fibres. This has motivated the development of amplifiers operating beyond the erbium gain window.
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!