Photonics and Nanostructures-Fundamentals and Applications最新文献

英文中文

Tuneability and optimum functionality of plasmonic transparent conducting oxide-Ag core-shell nanostructures 等离子透明导电氧化物-银核壳纳米结构的可调性和最佳功能性

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2024-11-08 DOI: 10.1016/j.photonics.2024.101326

Mohamed K. Zayed , Hesham Fares , Jamal Q.M. Almarashi , Samar Moustafa

Tunning localized surface plasmon resonance (LSPR) in transparent conducting oxides (TCO) has a great impact on various LSPR-based technologies. In addition to the commonly reported mechanisms used for tunning LSPR in TCOs (e.g., size, shape, carrier density modifications via intrinsic and extrinsic doping), integrating them in core-shell structures provides an additional degree of freedom to expand its tunability, enhance its functionality, and widen its versatility through application-oriented core-shell geometrical optimization. In this work, we explore the tuneability and functionality of two TCO nanostructures; indium doped tin oxide (ITO) and gallium doped zinc oxide (GZO) encapsulated with silver shell within the extended theoretical Mie theory formalism. The effect of core and shell sizes on LSPR peak position and line width as well as absorption and scattering coefficients is numerically investigated. Simulations showed that LSPRs of ITO-Ag and GZO-Ag core-shell nanostructures have great tunning capabilities, spanning from VIS to IR spectral range including therapeutic window of human tissue and essential solar energy spectrum. Potential functionality as refractive index sensor (RIS) and solar energy absorber (SEA) are examined using appropriate figure of merits

(FoM)

. Simulations indicate that a geometrically optimized core-shell architecture with exceptional

FoMs

for RIS and SEA can be realized. Contrary to carrier density manipulation, integrating TCO cores to metallic shells proves to be an effective approach to enhance tunability and optimize functionality for high performance TCO-based plasmonic devices, with minimum impact on the inherited physical and chemical properties of the used TCO-core materials.

在透明导电氧化物（TCO）中调谐局部表面等离子体共振（LSPR）对各种基于 LSPR 的技术具有重大影响。除了通常报道的用于调谐 TCO 中 LSPR 的机制（如尺寸、形状、通过本征和外征掺杂改变载流子密度）之外，将它们集成到核壳结构中还提供了额外的自由度，可通过面向应用的核壳几何优化来扩展其可调谐性、增强其功能性和拓宽其通用性。在这项工作中，我们在扩展的理论米氏理论模型中探索了两种 TCO 纳米结构（掺铟氧化锡（ITO）和掺镓氧化锌（GZO）银壳封装）的可调性和功能性。数值研究了内核和外壳尺寸对 LSPR 峰值位置和线宽以及吸收和散射系数的影响。模拟结果表明，ITO-Ag 和 GZO-Ag 核壳纳米结构的 LSPR 具有很强的调谐能力，光谱范围从 VIS 到 IR，包括人体组织的治疗窗口和基本的太阳能光谱。利用适当的优点系数（FoM）研究了折射率传感器（RIS）和太阳能吸收器（SEA）的潜在功能。模拟结果表明，经过几何优化的核壳结构可以实现卓越的折射率传感器和太阳能吸收器的优越性。与载流子密度操作相反，将 TCO 内核集成到金属壳上被证明是提高可调性和优化基于 TCO 的高性能等离子器件功能的有效方法，同时对所用 TCO 内核材料的固有物理和化学特性影响最小。

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引用次数: 0

Plasmonic MIM waveguide based FR sensors for refractive index sensing of human hemoglobin 基于等离子 MIM 波导的 FR 传感器用于人体血红蛋白的折射率检测

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2024-10-31 DOI: 10.1016/j.photonics.2024.101325

Lokendra Singh , Bukya Balaji , Yogesh Tripathi , Roshan Kumar , Sameer Yadav

Fano resonance (FR) is a universal phenomenon that is used to attain electromagnetic-induced transparency (EIT), high absorption and sensitivity, and low-power photonic devices. This work presents dual FR refractive index (RI) sensor models on a plasmonic metal-insulator-metal (MIM) waveguide system. The FR phenomenon is attained by including circular and elliptic nanorod defects in the bus waveguides. The resonances originate from the defect's narrow discreteness and the rectangular resonator's broad state. Analytical methods such as finite difference time domain (FDTD) and multimode interference coupled mode theory are adopted to analyze the FRs. The shapes of the Fano line and resonance peak amplitude can be tuned independently by controlling the diameter of the defects, the separation between the defects, and the coupling (between the resonator and the bus waveguide) distance. Moreover, the proposed structures detect the RI (human hemoglobin) variation in the bus waveguide and resonator. The obtained results with circular nanorod defect verify the autocorrelation coefficient of 99.92 %, ensuring the device's linearity and high performance. However, an autocorrelation of 99.7 % is attained by using two elliptic nanorod defects.

法诺共振（FR）是一种普遍现象，可用于实现电磁诱导透明（EIT）、高吸收和高灵敏度以及低功耗光子器件。本研究在等离子金属-绝缘体-金属 (MIM) 波导系统上提出了双 FR 折射率 (RI) 传感器模型。通过在总线波导中加入圆形和椭圆形纳米棒缺陷，实现了 FR 现象。共振源于缺陷的窄离散性和矩形谐振器的宽状态。分析方法包括有限差分时域（FDTD）和多模干涉耦合模式理论。通过控制缺陷直径、缺陷间距和耦合（谐振器与总线波导之间）距离，可以独立调整法诺线的形状和谐振峰幅度。此外，所提出的结构还能检测总线波导和谐振器中的 RI（人体血红蛋白）变化。使用圆形纳米棒缺陷获得的结果验证了 99.92 % 的自相关系数，确保了设备的线性和高性能。然而，通过使用两个椭圆形纳米棒缺陷，自相关系数达到了 99.7%。

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引用次数: 0

224-fs soliton pulses generation at 1μm from ytterbium-doped fiber laser with CoTe2 nanosheets as an ultrafast modulator 以 CoTe2 纳米片为超快调制器，在 1μm 波长下从掺镱光纤激光器中产生 224-fs 孤子脉冲

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2024-10-30 DOI: 10.1016/j.photonics.2024.101324

Jian-Xiang Zhang , Qian Wang , Kelei Miao

Transition metal ditellurides (TMDTs) have numerous attractive properties, making them suitable for a wide range of applications. In this study, cobalt ditelluride (CoTe₂) nanosheets, a promising TMDT for photonic applications, were prepared using an ultrasound-enhanced liquid phase exfoliation (LPE) method. A novel saturable absorber (SA) employing CoTe₂ nanosheets was then fabricated by optically depositing them on microfiber. The nonlinear optical modulation properties of the CoTe₂ SA were investigated. A high-performance 1 μm ultrafast fiber laser was demonstrated by incorporating newly developed CoTe₂ nanosheets-based SA in a ring cavity ytterbium-doped fiber laser (YDFL). The dynamical behaviour of the proposed passively mode-locked YDFL in response to variations in pump optical power was investigated. The findings reveal that the device achieved a modulation depth of 2.5 %, and saturation light intensity of 30.6 MW/cm². Moreover, a stable and robust mode-locked soliton optical pulse sequence with a fundamental repetition frequency of 3.089 MHz, and a pulse duration of 224 fs was generated at 1032 nm. The proposed YDFL, being all-fiber, compact, and cost-effective, is set to find extensive applications in various domains, including optical fiber communication, sensing, and biomedical imaging.

过渡金属二碲化镉（TMDTs）具有许多吸引人的特性，因此适合广泛的应用。本研究采用超声波增强液相剥离（LPE）法制备了一种具有光子应用前景的过渡金属二碲化镉（CoTe2）纳米片。然后，通过光学方法将 CoTe2 纳米片沉积在超细纤维上，制成了一种采用 CoTe2 纳米片的新型可饱和吸收器（SA）。研究了 CoTe2 SA 的非线性光学调制特性。通过在环腔掺镱光纤激光器（YDFL）中加入新开发的基于 CoTe2 纳米片的 SA，演示了高性能 1 μm 超快光纤激光器。研究了所提出的被动锁模 YDFL 响应泵浦光功率变化的动态特性。研究结果表明，该装置的调制深度为 2.5%，饱和光强为 30.6 MW/cm2。此外，还在 1032 nm 波长下产生了一个稳定、稳健的锁模孤子光脉冲序列，其基本重复频率为 3.089 MHz，脉冲持续时间为 224 fs。所提出的 YDFL 具有全光纤、结构紧凑和成本效益高等特点，必将在光纤通信、传感和生物医学成像等各个领域得到广泛应用。

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引用次数: 0

A hybrid mode splitter for separation and excitation of photonic crystal odd and even modes using plasmonic waveguides 利用等离子波导分离和激发光子晶体奇数和偶数模式的混合模式分离器

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2024-10-26 DOI: 10.1016/j.photonics.2024.101323

Ehsan Beiranvand, Mohammad Danaie, Majid Afsahi

This study introduces a mode splitter through a novel coupling mechanism between photonic crystal waveguides and metal-insulator-metal plasmonic waveguides. Notably, the proposed structure demonstrates the capability to excite both odd and even modes within the photonic crystal waveguide. Numerical simulations of this structure were conducted using the finite difference time domain (FDTD) method. Our numerical analysis reveals an exceptional transmittance of 95 % at the waveguide intersection for the wavelength of 1550 nm. The successful coupling of plasmonic waveguides to photonic crystal waveguides unveils a vast array of opportunities for designing innovative devices that harness the synergistic potential arising from the distinctive characteristics of surface plasmons and photonic crystals. An inherent advantage of this design lies in its simple topology, enabling cost-effective and precise manufacturing processes. This device offers the ability to accurately separate and identify output modes. Additionally, we utilize this coupler in the design of a highly efficient power divider that not only achieves high transmittance but also provides adjustable control over the output power level.

本研究通过光子晶体波导与金属-绝缘体-金属质子波导之间的新型耦合机制，介绍了一种模式分离器。值得注意的是，所提出的结构展示了在光子晶体波导内激发奇数和偶数模式的能力。我们使用有限差分时域（FDTD）方法对该结构进行了数值模拟。我们的数值分析表明，在波长为 1550 nm 时，波导交叉点的透射率高达 95%。等离子体波导与光子晶体波导的成功耦合为设计创新设备提供了大量机会，这些设备可利用表面等离子体和光子晶体的独特特性所产生的协同潜力。这种设计的固有优势在于其拓扑结构简单，可实现经济高效的精确制造工艺。这种装置能够精确分离和识别输出模式。此外，我们还利用这种耦合器设计了一种高效功率分配器，不仅实现了高透射率，还提供了对输出功率电平的可调控制。

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引用次数: 0

Temperature-modulated acetone monitoring using Al2O3-coated evanescent wave fiber optic sensors 使用 Al2O3 涂层蒸发波光纤传感器进行温度调制丙酮监测

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2024-10-24 DOI: 10.1016/j.photonics.2024.101322

P. Manivannan, Zachariah C. Alex

This paper presents an experimental study of a fiber-optic-based acetone sensor and its temperature effects for use as a breath analyzer to detect acetone in exhaled breath. The study employs fiber optic evanescent wave-based acetone sensing, utilizing sputter coated Aluminium Oxide (Al₂O₃)-coated probes fabricated via clad modification technique. The optical fibers were coated with Al₂O₃ to achieve thicknesses of 247.03 nm, 334.05 nm, and 468.75 nm. The sensor probes were characterized using, Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive Spectroscopy (EDS), X-ray Diffraction (XRD), Ultraviolet-Visible (UV-Vis) Spectroscopy, and Spectroscopic Ellipsometry for uniformity, elemental, optical constants, and thickness of the Al₂O₃. The spectral responses of the probes were analyzed for acetone concentrations ranging from 0 to 100 ppm, with temperature modulation from room temperature to 100 °C. The probe with a ∼334 nm thick Al₂O₃ coating exhibited the highest response, reaching 6.2 % at 100 °C in 100 ppm acetone. Linear regression revealed that the ∼334 nm coated probe had the highest sensitivity at 5.98 counts/ppm. The sensor showed response and recovery times of approximately 12 and 17 seconds, respectively. This study underscores the stability and repeatability of temperature-modulated Al₂O₃-coated fiber optic sensors for selective acetone detection in various non-invasive applications.

本文介绍了一种基于光纤的丙酮传感器及其温度效应的实验研究，该传感器可用作呼气分析仪，检测呼气中的丙酮。该研究采用基于光纤蒸发波的丙酮传感技术，利用通过包覆改性技术制造的溅射氧化铝（Al2O3）涂层探头。光纤上的 Al2O3 涂层厚度分别为 247.03 nm、334.05 nm 和 468.75 nm。使用场发射扫描电子显微镜 (FESEM)、能量色散光谱仪 (EDS)、X 射线衍射 (XRD)、紫外-可见 (UV-Vis) 光谱仪和光谱椭偏仪对传感器探针进行了表征，以确定 Al2O3 的均匀性、元素、光学常数和厚度。探针的光谱响应在丙酮浓度为 0 至 100 ppm 时进行分析，温度调节范围为室温至 100 °C。镀有 ∼334 nm 厚 Al2O3 涂层的探针响应最高，在 100 °C、100 ppm 丙酮浓度条件下达到 6.2%。线性回归显示，镀有 ∼334 nm 涂层的探头灵敏度最高，达到 5.98 计数/ppm。传感器的响应和恢复时间分别约为 12 秒和 17 秒。这项研究强调了温度调制 Al2O3 涂层光纤传感器在各种非侵入式应用中选择性检测丙酮的稳定性和可重复性。

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引用次数: 0

Cage-like micro-scaffolds fabricated by DLW method for cell investigation 利用 DLW 方法制作用于细胞研究的笼状微支架

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2024-10-11 DOI: 10.1016/j.photonics.2024.101321

A.V. Pisarenko , D.S. Burkatovskii , D.A. Kolymagin , D.A. Chubich , V.I. Borshchevskiy , A.G. Vitukhnovsky

This paper focuses on the use of direct laser writing method in fabricating three-dimensional biocompatible scaffolds that emulate the extracellular matrix. The interaction between HEK 293 cells and these cage-like scaffolds, particularly the effect of pore size on cell invasion, is explored in detail. Our study underscores the influence of scaffold architecture on cellular behavior and highlights the potential of direct laser writing technology in creating complex 3D scaffolds. The insights gleaned from this research could be invaluable in future applications such as tissue engineering, regenerative medicine, and drug delivery.

本文重点介绍了利用激光直接写入法制造仿细胞外基质的三维生物兼容支架的方法。本文详细探讨了 HEK 293 细胞与这些笼状支架之间的相互作用，特别是孔径对细胞侵袭的影响。我们的研究强调了支架结构对细胞行为的影响，并突出了直接激光写入技术在创建复杂三维支架方面的潜力。从这项研究中获得的洞察力在未来的组织工程、再生医学和药物输送等应用中可能非常有价值。

引用次数: 0

Bifunctional terahertz metamaterial device with switchable properties between transmission and broadband absorption 可在传输和宽带吸收之间切换特性的双功能太赫兹超材料器件

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2024-10-09 DOI: 10.1016/j.photonics.2024.101317

Shilin Ma , Xianwu Mi , Xiulong Bian

A bifunctional terahertz metamaterial device with switchable properties between transmission and broadband absorption is proposed. The simulated results show that the switchable functional characteristics of the bifunctional terahertz metamaterial device can be achieved by taking advantage of the phase transition property of VO₂. When VO₂ is in the insulating state, there are transmission spectra with a maximum transmittance of 90 % and a minimum transmittance of 25 % in the frequency range from 1 THz to 10 THz. Meanwhile, transmission spectra be adjusted by controlling the Fermi level of graphene. When VO₂ is in the fully metal state, the broadband absorptivity achieves over 90 % in the frequency range from 2.54 THz to 7.65 THz. Not only that, the absorption spectra can be continuously adjusted by controlling the conductivity of VO₂ from 20 to 200000 S/m. Alternatively, the proposed bifunctional terahertz metamaterial device can work and show the same absorption spectra when the conductivity of VO₂ is 200000 S/m under TM and TE polarized normal incidences. Our current research work has a potential to provide a valuable reference for the advancement of transmissive and broadband absorbent metamaterial devices in the terahertz range.

本文提出了一种可在传输和宽带吸收之间切换的双功能太赫兹超材料器件。模拟结果表明，双功能太赫兹超材料器件的可切换功能特性可以通过利用 VO2 的相变特性来实现。当 VO2 处于绝缘状态时，在 1 太赫兹到 10 太赫兹的频率范围内，存在最大透射率为 90%、最小透射率为 25%的透射光谱。同时，还可以通过控制石墨烯的费米级来调整透射光谱。当 VO2 处于完全金属态时，在 2.54 太赫兹至 7.65 太赫兹的频率范围内，其宽带吸收率超过 90%。不仅如此，还可以通过控制 VO2 的电导率在 20 到 200000 S/m 之间不断调整吸收光谱。另外，当 VO2 的电导率为 200000 S/m 时，所提出的双功能太赫兹超材料器件也能在 TM 和 TE 偏振法线发生率下工作，并显示出相同的吸收光谱。我们目前的研究工作有望为太赫兹范围内透射和宽带吸收超材料器件的发展提供有价值的参考。

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引用次数: 0

Design and optimization of a polarization-insensitive terahertz metamaterial absorber for sensing applications 设计和优化用于传感应用的偏振不敏感太赫兹超材料吸收器

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2024-10-09 DOI: 10.1016/j.photonics.2024.101314

Neelam Singh , Reshmi Dhara , Sanjeev Yadav

This study presents dual-band Terahertz (THz) metamaterial absorbers (MA) designed with square resonators for sensing applications. The absorber is made up of a plasmonic ring resonator, a middle polyimide layer, and a lower metal plate, which enhances its absorption capabilities. The position of annular strips and patch units is strategically adjusted to tune and optimize the absorber’s performance precisely. The proposed metamaterial (MA) consistently absorbs over 99 % within the frequency range from 1.4 to 2.8 THz at 1.6 THz for peak-1 and 2.3 THz for peak-2. The peaks labeled as ‘f1’ and ‘f2’ have a spectral width of 0.02 THz and high-quality factors (Q-factors) of 23 for peak-1 and 29 for peak-2, respectively. This makes them remarkably sensitive to variations in the environmental refractive index (RI). It is important to observe that the refractive index of most samples falls within the range of 1.0–2.0, highlighting the potential applications of this sensor.

本研究介绍了采用方形谐振器设计的用于传感应用的双频太赫兹（THz）超材料吸收器（MA）。该吸收器由一个等离子体环形谐振器、中间的聚酰亚胺层和下部的金属板组成，从而增强了其吸收能力。通过战略性地调整环形条带和贴片单元的位置，可以精确地调整和优化吸收器的性能。在 1.4 至 2.8 太赫兹的频率范围内，拟议的超材料 (MA) 的吸收率始终保持在 99% 以上，峰值-1 为 1.6 太赫兹，峰值-2 为 2.3 太赫兹。标记为 "f1 "和 "f2 "的峰值的光谱宽度为 0.02 THz，峰值-1 和峰值-2 的高质量系数（Q 系数）分别为 23 和 29。这使得它们对环境折射率 (RI) 的变化非常敏感。值得注意的是，大多数样品的折射率都在 1.0-2.0 范围内，这凸显了该传感器的潜在应用价值。

引用次数: 0

Constraints on co- and cross-polarization reflection and transmission of Babinet-complementary metasurfaces 巴比内互补元表面的同极化和跨极化反射与透射的约束条件

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2024-10-09 DOI: 10.1016/j.photonics.2024.101320

A.G. Zhuravlev , L.M. Pulido-Mancera , A.D. Sayanskiy , V.A. Lenets , S.B. Glybovski , J.D. Baena

A study of constraints on reflection and transmission coefficients for Babinet-complementary metasurfaces is presented in this work. These coefficients have been found to describe circular paths in the complex plane, whose centers and radii are affected by losses. Additionally, it has been shown that it is possible to fully control the cross-polarization coefficients by rotating the metasurface with respect to the polarization direction. Our findings have been verified through numerical simulations and experiments. The properties discussed in this paper could be useful in limiting the types of possible responses of metasurfaces.

本研究介绍了对巴比内互补元曲面的反射和透射系数约束的研究。研究发现，这些系数描述了复平面上的圆形路径，其中心和半径受到损耗的影响。此外，研究还表明，通过相对于极化方向旋转元表面，可以完全控制交叉极化系数。我们的发现已通过数值模拟和实验得到验证。本文讨论的特性有助于限制元表面可能的响应类型。

引用次数: 0

CMOS-compatible plasmonic magnetic field sensor: An alternative approach using ultra-compact MIM configuration CMOS 兼容型等离子体磁场传感器：使用超紧凑 MIM 配置的替代方法

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications

Pub Date : 2024-10-05 DOI: 10.1016/j.photonics.2024.101319

Mohammad Ashraful Haque , Rummanur Rahad , Md. Omar Faruque , Abu S.M. Mohsin

This paper introduces a novel magnetic field sensor (MFS) that utilizes a metal-insulator-metal (MIM) waveguide integrated with a resonator structure and incorporates water-based Fe₃O₄ magnetic fluid. The sensor uses titanium nitride (TiN) as the plasmonic material which offers numerous advantages over conventional noble plasmonic materials. The sensor takes advantage of the tunable optical properties of the magnetic fluid and TiN to detect changes in the external magnetic field and quantify the magnetic field strength which has been demonstrated using the Finite Element Method (FEM). Our proposed MFS exhibits a high sensitivity of 11.97 pm/Oe, a narrow-band full-width half maximum of 93.66 nm, and a resolution of 8.36 × 10⁻⁴ Oe. The sensor is also compatible with complementary metal oxide semiconductor (CMOS) fabrication techniques, which enables chip-scale integration and low-cost production. The sensor can be used for various applications in navigation, military, space, healthcare, and beyond.

本文介绍了一种新型磁场传感器（MFS），该传感器利用金属-绝缘体-金属（MIM）波导与谐振器结构集成，并加入了水基 Fe3O4 磁性流体。该传感器使用氮化钛（TiN）作为等离子材料，与传统的惰性等离子材料相比具有诸多优势。传感器利用磁性流体和氮化钛的可调光学特性来检测外部磁场的变化，并用有限元法（FEM）对磁场强度进行量化。我们提出的 MFS 具有 11.97 pm/Oe 的高灵敏度、93.66 nm 的窄带全宽半最大值和 8.36 × 10-4 Oe 的分辨率。该传感器还兼容互补金属氧化物半导体（CMOS）制造技术，实现了芯片级集成和低成本生产。该传感器可用于导航、军事、太空、医疗保健等领域的各种应用。

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