Results 201 to 210 of about 85,964 (311)

Chiral Quasi‐BICs Stemming From a Γ‐point Degeneracy

Laser &Photonics Reviews, EarlyView.
Band degeneracies universally exist in 2D periodic systems. However, the studies on the intrinsic properties of those isolated points remain limited. By exploring 3D chiral perturbations, chiral quasi‐BICs are achieved through a Γ‐point degeneracy in resonant metasurfaces with C4 symmetry.
Bohan Zhang, Dongha Yang, Yuhao Wu, Mingqi Zheng, Wei Zhu, Lei Kang, Kang Du, Douglas H. Werner, Shengxiang Wang   +8 more
wiley   +1 more source

Terahertz Metasurface with Four-Degree-of-Freedom Geometric Encoding for Broadband Multichannel Fingerprint Sensing. [PDF]

Nanomaterials (Basel)
Meng J, Hao W, Wang T, Shi Y, Xu W, Pan M.   +5 more
europepmc   +1 more source

Dual‐Comb Spectroscopy With Fully Controlled Repetition Rate and Offset Frequency of Quantum Cascade Laser Frequency Combs

Laser &Photonics Reviews, EarlyView.
Independent control of the repetition rate and offset frequency is demonstrated in quantum cascade laser frequency combs using radio‐frequency injection and thermal tuning. A revised comb model anchored at optical frequencies captures the unique behavior under radio‐frequency injection and enables precise frequency control.
Jie Liu, Philip Skochinski, Lawrence Hughes, Yamac Dikmelik, Kevin Lascola, Gerard Wysocki   +5 more
wiley   +1 more source

Ultra-broadband Terahertz spectroscopy with Terahertz air photonics

, 2016
Terahertz (THz) spectroscopy is a well-established technique which allows for measuring the complex-valued dielectric properties of materials, specifically semiconductors, in the THz range. As THz photons have a low energy, typically comparable to intraband transitions, they are ideal probes of important phenomena such as the momentum relaxation of ...
openaire   +2 more sources

Broadband Chromatic Dispersion of Thermo‐Refractive Coefficients and Its Impact in Silicon Nitride Nonlinear Photonics

Laser &Photonics Reviews, EarlyView.
Chromatic dispersion of material thermo‐refractive coefficients is characterized across an octave in integrated Si3N4${\rm Si}_3{\rm N}_4$/SiO2${\rm SiO}_2$ platforms. A 7% variation is observed from telecom to visible wavelengths, while incorporating this dispersion into multiphysics modeling captures frequency‐dependent resonance shifts and improves ...
Shao‐Chien Ou, Grégory Moille, Kartik Srinivasan   +2 more
wiley   +1 more source

Upconversion detection of terahertz wave with nanosecond pulse duration using continuous-wave laser. [PDF]

Sci Rep
Liu N, Yuan J, Zhang X, Jiao B, Dai X, Fan S.   +5 more
europepmc   +1 more source

Time‐Modulated Optomechanics Reveal Energy Flow and Inelastic Interactions Between Acoustic Phonons in Nanomembranes

Laser &Photonics Reviews, EarlyView.
Temporal interfaces are abrupt refractive index changes used in time‐varying optics, but also transitions to nonequilibrium states. This work explores the inelastic scattering of time‐varying light by nonthermal acoustic phonons in the vicinity of temporal interfaces.
Anuj Kumar Dhiman, Piotr Graczyk, Tobias Held, Mikolaj Pochylski, Kleoniki Sympoura, Rafal Bialek, Jacek Gapinski, Bahram Djafari Rouhani, Baerbel Rethfeld, Bartlomiej Graczykowski, Thomas Vasileiadis   +10 more
wiley   +1 more source

Low-Threshold Optical Bistability in Detuned DBR Heterostructures Integrated with Dirac Semimetals. [PDF]

Nanomaterials (Basel)
Wu Y, Hu J, Wu W, Wang Y.
europepmc   +1 more source

Single‐Lens Counter‐Focused Ultrashort Laser Pulses for Enhanced Microplasma Formation Inside Silicon

Laser &Photonics Reviews, EarlyView.
A polarization‐dependent liquid–crystal spatial light modulator is used to generate coaxial double‐focus laser beams with independently tunable focal separation and intensity. Applied to silicon, this configuration enables counterpropagating pulse interactions using a single focusing element, enhancing nonlinear excitation and achieving near‐critical ...
Niladri Ganguly, David Grojo, Pol Sopeña   +2 more
wiley   +1 more source

Tunable Terahertz Optical Bistability Enabled by Synergistic Topological Edge States and Weyl Semimetal. [PDF]

Nanomaterials (Basel)
Li Z, Shen Z, Qian L, Zheng Z, Jiang L.
europepmc   +1 more source