APL Photonics最新文献_第4页

Optical coherence tomography imaging and noise characterization based on 1-μm microresonator frequency combs 基于 1μm 微谐振器频率梳的光学相干断层成像和噪声表征

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-08-15 DOI: 10.1063/5.0215574

T. Melton, J. F. McMillan, J. Yang, W. Wang, Y. Lai, M. Gerber, M. Rodriguez, J. P. Hubschman, K. Nouri-Mahdavi, C. W. Wong

引用次数: 0

Load-dependent optical coherence tomography attenuation imaging: How tissue mechanics can influence optical scattering 随负荷变化的光学相干断层衰减成像：组织力学如何影响光学散射

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-08-14 DOI: 10.1063/5.0208026

Peijun Gong, Imogen Boman, Renate Zilkens, Chris Yeomans, Mireille Hardie, Anmol Rijhumal, Christobel M. Saunders, Brendan F. Kennedy

{"title":"Load-dependent optical coherence tomography attenuation imaging: How tissue mechanics can influence optical scattering","authors":"Peijun Gong, Imogen Boman, Renate Zilkens, Chris Yeomans, Mireille Hardie, Anmol Rijhumal, Christobel M. Saunders, Brendan F. Kennedy","doi":"10.1063/5.0208026","DOIUrl":"https://doi.org/10.1063/5.0208026","url":null,"abstract":"Mechanical load imparted to tissue, for example via handheld imaging probes, leads to tissue deformation, altering the distribution of tissue microstructure and, consequently, attenuation of light and image formation in optical imaging. In mechanically heterogeneous tissue, the load can result in spatially varying deformation and, therefore, spatially varying changes in the attenuation of light, which may provide additional image contrast. To investigate this potential, an assessment of the spatially resolved impact of mechanical deformation of the tissue on optical imaging is critical; however, it is challenging to incorporate stress mapping into optical imaging without obscuring the detection of photons. To address this, we present the novel integration of stress imaging using optical palpation with attenuation imaging based on optical coherence tomography (OCT). The method was implemented using a compliant silicone sensor incorporated into a custom handheld OCT probe, providing two-dimensional stress imaging with concurrent attenuation imaging. Attenuation imaging with varying mechanical loads was demonstrated on 19 tissue regions acquired from eight freshly excised human breast specimens. The results demonstrated distinct characteristics for different breast tissue types: benign stroma showed relatively large increases in attenuation (e.g., ∼0.3 to 0.4 mm−1/kPa) over a low stress range (∼2 to 10 kPa), while cancerous tissue showed markedly small increases in attenuation (e.g., ∼0.005 to 0.02 mm−1/kPa) mainly over a medium to high stress range (∼10 to 90 kPa). The integration of stress imaging with attenuation imaging provided a pilot assessment of the spatially resolved impact of tissue mechanical heterogeneity on optical attenuation, providing novel image contrast by encoding variations in mechanical properties on optical attenuation in tissue.","PeriodicalId":8198,"journal":{"name":"APL Photonics","volume":"29 1","pages":""},"PeriodicalIF":5.6,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-power in-phase and anti-phase mode emission from linear arrays of resonant-tunneling-diode oscillators in the 0.4-to-0.8-THz frequency range 谐振-隧道-二极管振荡器线性阵列在 0.4 至 0.8 千兆赫频率范围内的高功率同相和反相模式发射

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-08-07 DOI: 10.1063/5.0213695

Fanqi Meng, Zhenling Tang, Petr Ourednik, Jahnabi Hazarika, Michael Feiginov, Safumi Suzuki, Hartmut G. Roskos

{"title":"High-power in-phase and anti-phase mode emission from linear arrays of resonant-tunneling-diode oscillators in the 0.4-to-0.8-THz frequency range","authors":"Fanqi Meng, Zhenling Tang, Petr Ourednik, Jahnabi Hazarika, Michael Feiginov, Safumi Suzuki, Hartmut G. Roskos","doi":"10.1063/5.0213695","DOIUrl":"https://doi.org/10.1063/5.0213695","url":null,"abstract":"Oscillators based on resonant tunneling diodes (RTDs) are able to reach the highest oscillation frequency among all electronic THz emitters. However, the emitted power from RTDs remains limited. Here, we propose linear RTD oscillator arrays capable of supporting coherent emission from both in-phase and anti-phase coupled modes. The oscillation modes can be selected by adjusting the mesa areas of the RTDs. Both the modes exhibit constructive interference at different angles in the far field, enabling high-power emission. Experimental demonstrations of coherent emission from linear arrays containing 11 RTDs are presented. The anti-phase mode oscillates at ∼450 GHz, emitting about 0.7 mW, while the in-phase mode oscillates at around 750 GHz, emitting about 1 mW. Moreover, certain RTD oscillator arrays exhibit dual-band operation: changing the bias voltage allows for controllable switching between the anti-phase and in-phase modes. Upon bias sweeping in both directions, a notable hysteresis feature is observed. Our linear RTD oscillator array represents a significant step forward in the realization of large arrays for applications requiring continuous-wave THz radiation with substantial power.","PeriodicalId":8198,"journal":{"name":"APL Photonics","volume":"74 1","pages":""},"PeriodicalIF":5.6,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Propagation of broadband mid-infrared optical pulses in atmosphere 宽带中红外光脉冲在大气中的传播

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-08-06 DOI: 10.1063/5.0218225

Christian Hensel, Lenard Vamos, Igor Tyulnev, Ugaitz Elu, Jens Biegert

引用次数: 0

High-efficiency, broadband, and low-crosstalk 3D holography by multi-layer holographic-lens integrated metasurface 通过多层全息透镜集成元表面实现高效、宽带和低串扰三维全息技术

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-08-02 DOI: 10.1063/5.0218862

Shuo Sun, Jin Li, Xiaoxun Li, Xiangyu Huang, Yi Zhang, Liang Chen

{"title":"High-efficiency, broadband, and low-crosstalk 3D holography by multi-layer holographic-lens integrated metasurface","authors":"Shuo Sun, Jin Li, Xiaoxun Li, Xiangyu Huang, Yi Zhang, Liang Chen","doi":"10.1063/5.0218862","DOIUrl":"https://doi.org/10.1063/5.0218862","url":null,"abstract":"Holographic display is considered the holy grail of photorealistic three-dimensional (3D) visualization technology because it can provide arbitrary wavefronts related to the essential visual cues of 3D images. Metasurfaces with exceptional high-pixel light modulation capability are increasingly favored for implementing high-quality 3D holography. However, current 3D metasurface holography always has some trade-offs among lots of algorithmic data, acceptable time, image quality, and structure complexity. Therefore, the development of a high-efficiency 3D metasurface holography device is still necessary to meet the increasing high space bandwidth product (SBP) of 3D technology. Here, based on the holographic-lens (HL) computer-generated hologram (CGH) algorithm, we experimentally demonstrate a new 3D metasurface holography device that integrates the 3D image phase cues and multiple layers of virtual lenses with different focal lengths, which exhibits significant capabilities in terms of ultra-high spatial pixel modulation and the generation of high-quality 3D holography characterized by high-efficiency, broadband response, low-crosstalk, and reduced acceptable time. The HL-CGH algorithm was efficiently integrated into parameter-optimized α-Si nanopillar meta-atoms, enabling enhanced visualization of 3D clues in a lens-free system. The prepared 3D HL-metasurface holography presented the presence of multiple depths of a 3D holographic image across a broad spectral range (400–900 nm), providing enhanced 3D visual cues. Our work provides a new perspective on designing metasurface-driven high-SBP 3D holography.","PeriodicalId":8198,"journal":{"name":"APL Photonics","volume":"33 1","pages":""},"PeriodicalIF":5.6,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141881822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Digital signal processing techniques for noise characterization of lasers and optical frequency combs: A tutorial 用于激光器和光学频率梳噪声表征的数字信号处理技术：教程

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-08-01 DOI: 10.1063/5.0212592

Jasper Riebesehl, Holger R. Heebøll, Aleksandr Razumov, Michael Galili, Darko Zibar

{"title":"Digital signal processing techniques for noise characterization of lasers and optical frequency combs: A tutorial","authors":"Jasper Riebesehl, Holger R. Heebøll, Aleksandr Razumov, Michael Galili, Darko Zibar","doi":"10.1063/5.0212592","DOIUrl":"https://doi.org/10.1063/5.0212592","url":null,"abstract":"Performing noise characterizations of lasers and optical frequency combs on sampled data offers numerous advantages compared to analog measurement techniques. One of the main advantages is that the measurement setup is greatly simplified. Only a balanced detector followed by an analog-to-digital converter is needed, allowing all the complexity to be moved to the digital domain. Secondly, near-optimal phase estimators are efficiently implementable, providing accurate phase noise estimation in the presence of measurement noise. Finally, joint processing of multiple comb lines is feasible, enabling the computation of the phase noise correlation matrix, which includes all information about the phase noise of the optical frequency comb. This tutorial introduces a framework based on digital signal processing for phase noise characterization of lasers and optical frequency combs. The framework is based on the extended Kalman filter (EKF) and automatic differentiation. The EKF is a near-optimal estimator of the optical phase in the presence of measurement noise, making it very suitable for phase noise measurements. Automatic differentiation is key to efficiently optimizing many parameters entering the EKF framework. More specifically, the combination of EKF and automatic differentiation enables the efficient optimization of phase noise measurement for optical frequency combs with arbitrarily complex noise dynamics that may include many free parameters. We show the framework’s efficacy through simulations and experimental data, showcasing its application across various comb types and in dual-comb measurements, highlighting its accuracy and versatility. Finally, we discuss its capability for digital phase noise compensation, which is highly relevant to free-running dual-comb spectroscopy applications.","PeriodicalId":8198,"journal":{"name":"APL Photonics","volume":"79 1","pages":""},"PeriodicalIF":5.6,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141881906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

5–13.5 μm broadband tunable long-wave infrared femtosecond laser 5-13.5 μm 宽带可调谐长波红外飞秒激光器

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-08-01 DOI: 10.1063/5.0221273

Yunpeng Liu, Junyu Qian, Renyu Feng, Wenkai Li, Yanyan Li, Yujie Peng, Yuxin Leng

引用次数: 0

Ultrahigh reflectivity photonic crystal membranes with optimal geometry 具有最佳几何形状的超高反射率光子晶体膜

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-07-30 DOI: 10.1063/5.0204067

F. Zhou, Y. Bao, J. J. Gorman, J. R. Lawall

{"title":"Ultrahigh reflectivity photonic crystal membranes with optimal geometry","authors":"F. Zhou, Y. Bao, J. J. Gorman, J. R. Lawall","doi":"10.1063/5.0204067","DOIUrl":"https://doi.org/10.1063/5.0204067","url":null,"abstract":"Photonic crystal (PhC) structures with subwavelength periods are widely used for diffractive optics, including high reflectivity membranes with nanoscale thickness. Here, we report on a design procedure for 2D PhC silicon nitride membrane mirrors providing optimal crystal geometry using simulation results obtained with rigorous coupled-wave analysis. The Downhill Simplex algorithm, a robust numerical approach to finding local extrema of a function of multiple variables, is used to optimize the period and hole radius of PhCs with both hexagonal and square lattices, as the membrane thickness is varied. Following these design principles, nanofabricated PhC membranes made from silicon nitride have been used as input couplers for an optical cavity, resulting in a maximum cavity finesse of 33 000, corresponding to a reflectivity of 0.999 82. The role played by the spot size of the cavity mode on the PhC was investigated, demonstrating the existence of an optimal spot size that agrees well with predictions. We find that, compared to the square lattice, the hexagonal lattice exhibits a spectrally wider reflective range, less sensitivity to fabrication tolerances, and higher reflectivity for membranes thinner than 200 nm, which may be advantageous in cavity optomechanical experiments. Finally, we find that all of the cavities that we have constructed exhibit well-resolved polarization mode splitting, which we expect is due primarily to a small amount of anisotropic stress in the silicon nitride and PhC asymmetry arising during fabrication.","PeriodicalId":8198,"journal":{"name":"APL Photonics","volume":"213 1","pages":""},"PeriodicalIF":5.6,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141870143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unified theory for frequency combs in ring and Fabry–Perot quantum cascade lasers: An order-parameter equation approach 环形和法布里-珀罗量子级联激光器中频率梳的统一理论：阶参数方程方法

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-07-26 DOI: 10.1063/5.0213323

Carlo Silvestri, Massimo Brambilla, Paolo Bardella, Lorenzo Luigi Columbo

{"title":"Unified theory for frequency combs in ring and Fabry–Perot quantum cascade lasers: An order-parameter equation approach","authors":"Carlo Silvestri, Massimo Brambilla, Paolo Bardella, Lorenzo Luigi Columbo","doi":"10.1063/5.0213323","DOIUrl":"https://doi.org/10.1063/5.0213323","url":null,"abstract":"We present a unified model to describe the dynamics of optical frequency combs in quantum cascade lasers (QCLs), incorporating both ring and Fabry–Pérot (FP) cavity configurations. The model derives a modified complex Ginzburg–Landau equation (CGLE), leveraging an order parameter approach, and is capable of capturing the dynamics of both configurations, thus enabling a comparative analysis. This result demonstrates that FP QCLs, in addition to ring QCLs, belong to the same universality class of physical systems described by the CGLE, which includes, among others, systems in the fields of superconductivity and hydrodynamics. In the modified CGLE, a nonlinear integral term appears that is associated with the coupling between counterpropagating fields in the FP cavity and whose suppression yields the ring model, which is known to be properly described by a conventional CGLE. We show that this crucial term holds a key role in inhibiting the formation of harmonic frequency combs (HFCs), associated with multi-peaked localized structures, due to its anti-patterning effect. We provide support for a comprehensive campaign of numerical simulations in which we observe a higher occurrence of HFCs in the ring configuration compared to the FP case. Furthermore, the simulations demonstrate the model’s capability to reproduce experimental observations, including the coexistence of amplitude and frequency modulation, linear chirp, and typical dynamic scenarios observed in QCLs. Finally, we perform a linear stability analysis of the single-mode solution for the ring case, confirming its consistency with numerical simulations and highlighting its predictive power regarding the formation of harmonic combs.","PeriodicalId":8198,"journal":{"name":"APL Photonics","volume":"45 1","pages":""},"PeriodicalIF":5.6,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141778381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tunable topological boundary modes enabled by synthetic translation dimension 通过合成平移维度实现可调谐拓扑边界模式

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-07-25 DOI: 10.1063/5.0211778

Zheng Guan, Xiao-Dong Chen, Hao-Chang Mo, Jian-Wei Liu, Qian-Yu Shu, Yuan Cao, Wen-Jie Chen, Jian-Wen Dong

{"title":"Tunable topological boundary modes enabled by synthetic translation dimension","authors":"Zheng Guan, Xiao-Dong Chen, Hao-Chang Mo, Jian-Wei Liu, Qian-Yu Shu, Yuan Cao, Wen-Jie Chen, Jian-Wen Dong","doi":"10.1063/5.0211778","DOIUrl":"https://doi.org/10.1063/5.0211778","url":null,"abstract":"Topological boundary modes, which are localized at the edge of topological materials, have received significant attention for their various applications in robust waveguides, optical cavities, and topological lasers. To envision their further applications in tunable devices, we propose and demonstrate a scheme to dynamically manipulate topological boundary modes by exploiting the two translation parameters of photonic crystals. We find that the translation not only transports the Wannier state similar to conventional Thouless pumping but also induces a nonzero Chern number in the two-dimensional synthetic space while preserving the time-reversal symmetry in the real space. Through changing the translation, gapless and tunable topological boundary modes are demonstrated. As a specific application, we show a dynamic bandpass filter with real-time tuning over 100% bandgap, a capability that cannot be achieved with only one translation parameter. Our design opens a venue for the development of tunable topological devices based on synthetic parameter dimension and can be generalized to other bosonic systems.","PeriodicalId":8198,"journal":{"name":"APL Photonics","volume":"412 1","pages":""},"PeriodicalIF":5.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141778384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0