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Holographically designed aperiodic lattices (ALs) have proven to be an exciting engineering technique for achieving electrically switchable single- or multi-frequency emissions in terahertz (THz) semiconductor lasers. Here, we employ the nonlinear transfer matrix modeling method to investigate multi-wavelength nonlinear (sum- or difference-) frequency generation within an integrated THz (idler) laser cavity that also supports optical (pump and signal) waves. The laser cavity includes an aperiodic lattice, which engineers the idler photon lifetimes and effective refractive indices.
View Article and Find Full Text PDFKNaCaRe(BO) (Re = Y, Lu): Two NLO Compounds Exhibiting a Short Absorption Edge in the AA'AeRe(BO) ( = 0, 1) Family.
Inorg Chem
January 2025
Institute of Crystal Growth, School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai201418, China.
The discovery and synthesis of new NLO materials in the ultraviolet (UV) region are crucial to developing laser technology. The chemical substitution strategy is an effective pathway to design potential UV or DUV NLO crystals. Herein, two new compounds, KNaCaY(BO) and KNaCaLu(BO), have been synthesized using KBO·4HO as the template.
View Article and Find Full Text PDFTopologically protected zero-directional refraction of elastic waves in a pillared phononic crystal plate.
J Acoust Soc Am
December 2024
College of Mechanical Engineering, University of South China, Hengyang, 421001, People's Republic of China.
Article Synopsis
- Zero-directional refraction occurs when waves bypass refraction at material interfaces, enabling innovative applications in optics and acoustics.
- Researchers have developed a pillared phononic crystal structure that allows for this refraction without needing a zero index of material parameters, which has been a significant challenge in past studies.
- By manipulating the structure's unit cell and inducing a topological phase transition, the elastic waves can exhibit robust zero-directional refraction, even amid obstacles like cavities and bends, paving the way for advanced wave emission technologies.
Dual-resonance optical fiber lossy mode resonance immunoprobe for serum PSA detection.
Biosens Bioelectron
March 2025
School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin, 300072, China.
Biomarker detection has emerged as an essential complementary approach for early-stage screening of tumors. Conventional methods are constrained by bulky systems, cumbersome operation steps, and low detection accuracy. Here, we demonstrate a dual-resonance optimally configured lossy mode resonance (LMR) immunoprobe for detecting prostate-specific antigen (PSA), a biomarker for prostate cancer (PCa).
View Article and Find Full Text PDFAsymmetric-coupled Ge/SiGe quantum wells for second harmonic generation at 7.1 THz in integrated waveguides: a theoretical study.
Nanophotonics
April 2024
Dipartimento di Fisica "E. Fermi", Università di Pisa, Largo Pontecorvo 3, 56127, Pisa, Italy.
We present a theoretical investigation of guided second harmonic generation at THz frequencies in SiGe waveguides embedding n-type Ge/SiGe asymmetric coupled quantum wells to engineer a giant second order nonlinear susceptibility. A characteristic of the chosen material system is the existence of large off-diagonal elements in the tensor, coupling optical modes with different polarization. To account for this effect, we generalize the coupled-mode theory, proposing a theoretical model suitable for concurrently resolving every second harmonic generation interaction among guide-sustained modes, regardless of which tensor elements it originates from.
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