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Optics Communications
North-Holland
Optics Communications

North-Holland

0030-4018

Optics Communications/Journal Optics CommunicationsSCIISTPEIAHCI
正式出版
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    Low-loss tunable add–drop filter assembled by whispering gallery mode microbubble resonator and biconical directional coupler

    Guo Y.Zhang Y.Yi G.
    7页
    查看更多>>摘要：? 2021A low-loss tunable add–dropfilter (LTADF) was analyzed in the theory in detail and demonstrated in an experiment, which was assembled by a whispering gallery mode (WGM) microbubble resonator (MBR) and biconical directional coupler (BDC). This scheme not only reduces the coupling loss by reducing the number of coupling points, replacing the traditional dual-coupling point configuration but also improves the mechanical stability of the system. Therefore, the device overcomes the loss caused by multipoint coupling and pattern mismatch. The LTADF configuration with a bandwidth of 7 GHz and an extinction ratio (ER) of more than 15 dB is realized using a high-Q-factor (～1e5) MBR cavity single-edged coupled with BDC. In addition, the transmission spectrum of the LTADF can be tuned by adjusting the axial and radial relative position between BDC and MBR. The pattern of interference in the transmission spectrum can be controlled by manipulating the relative position between BDC and MBR. The demonstrated LTADF gains advantages of low loss, narrow band, and tunable bandwidth, which will be helpful for its application in multiplexing systems, modulators, and optical switches.
      原文链接:
    • NSTL
    • Elsevier

    Error suppression for speckle correlation-based 3D shape measurement via dynamic shape function selection

    Yang X.Chen X.Xi J.
    8页
    查看更多>>摘要：? 2021Speckle correlation-based 3D shape measurement technology has an increasing number of applications in the fields of medical assistance, cultural relic protection, product manufacturing, and inspection. The foremost process of this method is the stereo matching of speckle image pairs using digital image correlation (DIC). It is challenging to improve the matching precision of DIC for complex shapes with large or abrupt curvature changes. Because the local curvature change and surface shape complexity of different objects vary, first-order and second-order shape functions have different abilities to describe the mapping relationship from the reference subset to the target subset. As a result, the systematic errors caused by subset under-matching and over-matching are also different. In this study, a pixel-by-pixel dynamic shape function selection algorithm is proposed for different measurement objects or different regions on the surface of the same object. Experimental results show that the proposed algorithm can effectively suppress the measurement error caused by the limited description ability of a specific shape function.
      原文链接:
    • NSTL
    • Elsevier

    Directly measuring mode purity of single component in known superposed optical vortices

    Ren Y.Liu T.Chen L.Qiu S....
    6页
    查看更多>>摘要：? 2021 Elsevier B.V.Mode purity is a vital quality reference of an optical vortex. This work proposes a self-interference method to directly measure the mode purity of a single component in known superposed optical vortices, based on the modified phase-shifting technology we proposed. This method has excellent flexibility, rapidity, and robustness, which can be applied to various occasions and harsh conditions. Careful alignment and optimized error analysis allow us to generate and measure optical vortices with mode purity as high as 99.997%.
      原文链接:
    • NSTL
    • Elsevier

    Sensitivity enhancement of surface plasmon resonance sensor using 2D material barium titanate and black phosphorus over the bimetallic layer of Au, Ag, and Cu

    Karki B.Pal A.Singh Y.Sharma S....
    10页
    查看更多>>摘要：? 2021 Elsevier B.V.A unique surface plasmon resonance (SPR) biosensors is proposed computationally in this paper, combining recently developed Perovskite (e.g., BaTiO 3) with 2D materials (e.g., black phosphorus) atop of standard SPR biosensors. The performance of the proposed structure, such as sensitivity, the figure of merit (FOM), and the quality factor (QF) of the sensors, are evaluated using the attenuated total reflection (ATR) approach. The Ag/BaTiO 3/BP, Au/BaTiO 3/BP and Cu/BaTiO 3/BP structures, respectively, have exceptionally high sensitivity of 360°/RIU, 299°/RIU, and 378°/RIU, which are 1.5, 0.55, and 1.86 times greater than the conventional silver (Ag), gold (Au), copper (Cu) based sensors, with equivalent FOM and QF. For the bimetallic layer first metal Ag, Au, and Cu-based sensors, the thickness of Ag/Au/Cu is 50/40/35nm, and the thickness of the second metal layer is 10 nm, and the number of BP layers is 0.34 for Ag/Au/Cu-based sensors. BaTiO 3 is employed in all cases with an optimum thickness of 5 nm. The proposed biosensors’ remarkable performance will pave the road for their implementation in future medical diagnostics and biological detection applications.
      原文链接:
    • NSTL
    • Elsevier

    Integrated fiber-based optoelectrode for electrochemiluminescence sensing

    Teng P.Li Z.Liu Z.Zhang J....
    6页
    查看更多>>摘要：? 2021An optical fiber-indium tin oxide (ITO) optoelectrode was proposed and first demonstrated in electrochemical luminescence (ECL) analyze. A transparent conductive ITO film was coated onto the surface of a bare optical fiber by magnetron sputtering. The optical fiber was realized as a working electrode and a detection device at the same time. Notably, the photoelectric analysis is integrated into the optical fiber electrode, providing more information about the analyte while greatly simplifying the device. The modulation of the ECL response intensity is monitored in real-time by applying different voltages to the fiber optic electrode with a response time of 2 s. In aqueous solutions, trace amount of H2O2 can be detected in real-time by the optical fiber ECL system. A wide detection range of 1 × 10?5 M to 1 × 10?2 M is obtained. Especially, the optical fiber-ITO electrode has great potentials in environmental analysis and bioassay.
      原文链接:
    • NSTL
    • Elsevier

    Elliptically polarized second-harmonic generation by local magnetic field in terahertz chiral metamaterials

    Yang Y.Liu C.Huang Y.Zhou Y....
    7页
    查看更多>>摘要：? 2021Elliptically polarized second-harmonic generation (SHG) is achieved in the terahertz region with a chiral metamaterial consisting of a gold gammadion and a doped GaAs cut wire under circularly polarized excitation. Remarkable SHG-circular dichroism (SHG-CD) is attributed to the local magnetic field induced by the magnetic resonance in the chiral gammadion and the current generated in the GaAs wire. The SHG-CD follows the parity conservation when the parity of the chiral metamaterial changes. The maximal modulation depth of the ellipticity and the polarization rotation angle of the SHG reach 91% and 72°, respectively, resulting from the change of the second harmonic field current density with different wire lengths. This work deepens the understanding of the nonlinear optical effect in metamaterials and puts forward the chiral metamaterials as efficient and helicity-tunable nonlinear terahertz sources.
      原文链接:
    • NSTL
    • Elsevier

    Extendable neural network and flexible extendable neural network in nanophotonics

    Guo X.Xu X.Li Y.Huang W....
    7页
    查看更多>>摘要：? 2021 Elsevier B.V.To alleviate the formidable training and dataset accumulation workload of the neural network for systems with multiple input/output parameters, i.e., high dimensionality and complexity, we present an extended neural network (ENN) and flexible ENN (FENN) to help modeling the scalable photonics devices and systems. ENN can save from 19.16% to 40% of the database collection cost comparing to the artificial NN (ANN) method when extending the modeling from 4- to 10-layer and 10- to 12-layer cases in the thin optical film studies. And the FENN can generate an appended general network for the iteratively added layers, therefore the decomposed functional sections of the system could be represented by the network, especially for structurally similar components in the photonic circuits.
      原文链接:
    • NSTL
    • Elsevier

    Tunable physical effects in Bi-mica hyperbolic structures

    Nazarov R.K.Zaitsev A.D.Zykov D.V.Demchenko P.S....
    9页
    查看更多>>摘要：? 2021 Elsevier B.V.Recent years, the need to create tunable THz devices emerged due to rapid development of THz photonics. As a rule, such devices are based on semiconductors and phase change materials, and the use of hyperbolic media based on these materials is a promising approach to realize terahertz wave near-field control. In this work, the dispersion of complex effective permittivity tensor of a layered structure consisting of 40 nm, 70 nm and 120 nm semimetallic Bi films on a top of 21 μm mica dielectric substrate, calculated on the basis of THz time-domain spectroscopy method, is used to theoretically estimate such effects as Purcell enhancement, Van Hove singularity, and Compton effect. The influence of continuous-wave optical pumping onto the optical properties of Bi-based hyperbolic medium and related effects is also studied in this work. The studied effects may be used in THz radiation enhancement, thermoelectric engineering and thermophotovoltaics, optical and electronic detection, molecular sensing, and even in development of spasers. The obtained results prove the possibility of application of Bi-mica composite in a development of fast-acting terahertz hyperbolic materials which are easy to produce due to their simple structure.
      原文链接:
    • NSTL
    • Elsevier

    Research on laser beams focusing and coupling technology of water jet guided laser with high adjustment tolerance

    Long Y.Zhong Z.Shi T.Huang Y....
    13页
    查看更多>>摘要：? 2021In the traditional water jet guided laser (WJGL) processing technology, a convex lens focused beam is used to couple into the water jet, and the coupling adjustment range is limited within the Rayleigh range of the focused beam, which results in large difficult adjustment. In this paper, combined concave axicon (CCA) and convex axicon (CVA) through pasting the two axicons in the circumferential direction is used to generate non-diffraction laser beam (NDLB) with micron level central spot, and a non-diffraction region (NDR) reaching tens to hundreds of millimeters and wide range of focal depth, realizing arbitrary random coupling in Z direction, which can reduce the difficulties of water jet coupling with laser beam (WJCLB) in WJGL and machining accuracy of single CVA with small cone angle. Numerical calculation, simulation and experimental analysis show that combined CCA and CVA possesses the characteristics of CVA. When the equivalent cone angle is less than 10° and the laser wavelength is 532 nm or 1064 nm, the central spot diameter of the NDR is less than 100μm and the focusing angle is less than 10°, which meets the critical condition of total reflection of water jet. In addition, the NDR of NDLB extends nearly 16 mm with an equivalent cone angle of 5° and a wavelength of 532 nm, effectively utilizing the coupling adjustment range of the NDR. The NDLB is successfully coupled into the water jet, and the central spot achieves a stable transmission with coupling efficiency about 92%. A method of adjustable ultra-fast NDLB with a combination of CVA and CCA and phase modulation is proposed constructively in order to better implement the technical scheme of water jet guided NDLB micro-machining with high adjustment tolerance possessing of WJCLB.
      原文链接:
    • NSTL
    • Elsevier

    A generic metasurface for the optical pulling of dielectric or plasmonic or chiral Mie objects

    Rahim M.Das S.C.Sunny M.M.M.Mahdy M.R.C....
    7页
    查看更多>>摘要：? 2021 Elsevier B.V.In the year 1902, scientists observed a phenomenon occurring at metal interface, known as Wood's anomaly, which led to the discovery of SPP (Surface Plasmon Polariton). Since then, SPP has received a great deal of attention due to its ability to direct light in the sub-wavelength scale. Their ability to pull objects of various materials, however, has not been thoroughly studied yet. Notably, creating pulling force for different types of particles in a single setup is quite challenging and rare in the literature. In this article, we propose a methodology through which exerting pulling force on spherical dielectric or plasmonic or chiral objects has been made possible within a common diameter range in an on-chip configuration by shining the light from the bottom of a metasurface. In our setup, two SPP waves have been excited by using periodic gratings made of metasurfaces placed on a metal–dielectric interface, which has created such optical pulling forces based on non-paraxial behavior of SPP. Pulling in dielectric object has been enabled due to the induced multipole radiation. The reversal of internal electric field and current density, due to interference field of SPP, has generated the pulling force for the plasmonic object. In contrast, the pulling force on chiral objects has been explained based on the direction of energy flow within the object. These changes occur when the SPP becomes non-paraxial enough for the three objects enabling on-chip object transportation and opening new boundaries for radius-based sorting, which can aid in the analysis of nanoparticle and biomolecules.
      原文链接:
    • NSTL
    • Elsevier