APL Photonics, Год журнала: 2024, Номер 9(6)
Опубликована: Июнь 1, 2024
Язык: Английский
Applied Physics Reviews, Год журнала: 2024, Номер 11(2)
Опубликована: Апрель 10, 2024
Exploring nanoscale material properties through light-matter interactions is essential to unveil new phenomena and manipulate materials at the atomic level, paving way for ground-breaking advancements in nanotechnology science. Various elementary excitations low-energy modes of reside terahertz (THz) range electromagnetic spectrum (0.1–10 THz) occur over various spatial temporal scales. However, due diffraction limit, a slew THz studies are restricted drawing conclusions from spatially varying responses around half probing wavelengths, i.e., tens couple hundred micrometers. To address this fundamental challenge, scanning near-field optical microscopy (SNOM), notably scattering-type SNOM (s-SNOM), combined with sources has been employed fueling growing interest technique across multiple disciplines. This review (1) provides an overview system developments SNOM, (2) evaluates current approaches understand quantify interactions, (3) explores advances applications, especially nano-scale employing s-SNOM, (4) envisions future challenges potential development avenues practical use s-SNOM.
Язык: Английский
Процитировано
19
Physical review. A/Physical review, A, Год журнала: 2025, Номер 111(4)
Опубликована: Апрель 17, 2025
Язык: Английский
Процитировано
0
Photonics, Год журнала: 2025, Номер 12(5), С. 466 - 466
Опубликована: Май 10, 2025
Frequency tuning nonlinearities in semiconductor lasers constitute a critical factor that degrades measurement precision and spectral resolution frequency-modulated continuous-wave (FMCW) LiDAR systems. This study systematically investigates the influence of nonlinear beat signal phase distortions on peak broadening develops phase-fitting-based pre-correction algorithm. To further enhance system performance, an electro-optic phase-locked loop architecture combined with non-uniform discrete Fourier transform processing is implemented, establishing comprehensive solution for nonlinearity suppression. Experimental validation demonstrates sub-18 µm standard deviation absolute distance measurements at 19 m target range. integrated approach represents significant advancement coherent frequency-sweep detection methodologies, offering considerable potential high-precision photonic radar applications.
Язык: Английский
Процитировано
0
The European Physical Journal Special Topics, Год журнала: 2025, Номер unknown
Опубликована: Май 27, 2025
Язык: Английский
Процитировано
0
IEEE photonics journal, Год журнала: 2024, Номер 16(2), С. 1 - 11
Опубликована: Фев. 27, 2024
Optical frequency comb (OFC) emission in quantum cascade lasers (QCLs) is highly attractive for applications metrology and sensing. Recently, coherent OFC mode-locking with large intermodal spacing was demonstrated QCLs. These self-starting harmonic combs (HFCs) show phase-stable operation promise interesting perspectives towards optical or even communication. Here, we present a detailed multi-domain modeling approach the numerical study of Our theoretical characterization divided into stationary carrier transport simulations, based on ensemble Monte Carlo method, dynamical simulations light-matter interaction, multi-level Maxwell-density matrix equations. We investigate influence chosen eigenstate basis gain spectrum self-consistent simulation results stable HFC double metal terahertz QCL. In our studied QCL medium shows different bias waveguide configurations, resulting mode up to twelve times cavity round trip frequency. Furthermore, characterize spectral time evolution formation process, yielding spontaneous build-up dense multimode state which gradually transferred broad clear state.
Язык: Английский
Процитировано
1
Optics Express, Год журнала: 2023, Номер 32(2), С. 1966 - 1966
Опубликована: Ноя. 22, 2023
We demonstrate the implementation of external cavity optical feedback to improve coherence and promote generation harmonic states by a mid-infrared quantum cascade laser frequency comb. In particular, we present Vernier-like scheme realize comb that increase repetition rate factor up 6 broaden spectral coverages from 46 cm -1 92 . Intermode beatnote dual characterization indicate has greatly improved for sub-optimal devices when is operated in these states. This approach control performance can be readily incorporated various sensing systems great potential spectroscopic measurements require high rates and/or broad bandwidth.
Язык: Английский
Процитировано
3
Micromachines, Год журнала: 2024, Номер 15(9), С. 1083 - 1083
Опубликована: Авг. 28, 2024
To address the requirement of functioning as a transmit/receive isolation device in terahertz transceiver systems, this paper, we present two high−isolation multi−branch waveguide directional couplers operating at center frequency 510 GHz. One is high−performance five−branch coupler, and other new type three−branch coupler with lower processing difficulty. Both were fabricated using low−cost CNC milling technologies. The performance these was verified through measurement results, demonstrating high frequency.
Язык: Английский
Процитировано
0
Optics & Laser Technology, Год журнала: 2024, Номер 182, С. 112112 - 112112
Опубликована: Ноя. 28, 2024
Язык: Английский
Процитировано
0
APL Photonics, Год журнала: 2024, Номер 9(6)
Опубликована: Июнь 1, 2024
Язык: Английский
Процитировано
0