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Dispersion tailoring of silicon nanowire optical rectangular waveguide (SNORW)
摘要： Dispersion analysis on silicon nanowire optical rectangular waveguide (SNORW) has been presented in this paper by guiding light inside low refractive index region. Dispersion engineering is an essential study to utilize any photonic integrated circuit-based waveguide in linear and nonlinear optical devices. This paper exhibits distinctive dispersion characteristics recognized in the wavelengths of S, C and L bands by tailoring physical parameters of SNORW. Modal investigation and numerical analysis have been carried out by finite element method (FEM), which shows that SNORW configuration enables the flat and low negative dispersion behavior. This paper also demonstrates the utilization of cladding materials and structural parameters of SNORW to tune the magnitude and behavior of dispersion for flat dispersion profile.
关键词： Silicon nanowire,Photonic integrated circuits,Optical waveguide,Dispersion,Silicon photonics,Photonic structure,Nanophotonics
更新于2025-09-16 10:30:52
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Low cross-talk waveguide intersections for TE polarization using photonic crystals
摘要： In this paper, two low cross-talk and wide bandwidth waveguide intersections are proposed based on novel types of resonators which are created using rotated photonic crystal lattices. A lattice of the air holes in a GaAs substrate is used to realize the waveguides. By inserting a second lattice of holes which resembles the main lattice, with a particular amount of scaling and rotation, we have created a resonator which can diminish the cross-talk in waveguide intersections. Two new topologies have been proposed based on the mentioned resonators, one with two sets of waveguides (four arms) and the other one with three sets of the waveguides (six arms). Plane wave expansion (PWE) and finite difference time domain (FDTD) methods are used for numerical simulation of the intersections. Simulation results indicate that a bandwidth of 49.1 nm and a cross-talk level of -40 dB can be obtained for the intersection of two waveguides using the configuration proposed in this paper.
关键词： Cross-talk,Optical waveguide,Photonic crystal,Integrated optics,Waveguide intersection
更新于2025-09-12 10:27:22
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Frequency-Multiplexed Photon Pairs Over 1000 Modes from a Quadratic Nonlinear Optical Waveguide Resonator with a Singly Resonant Configuration
摘要： We demonstrate a frequency multiplexed photon pair generation based on a quadratic nonlinear optical waveguide inside a cavity which confines only signal photons without confining idler photons and the pump light. We monolithically constructed the photon pair generator by a periodically poled lithium niobate (PPLN) waveguide with a high reflective coating for the signal photons around 1600 nm and with antireflective coatings for the idler photons around 1520 nm and the pump light at 780 nm at the end faces of the PPLN waveguide. We observed a comblike photon pair generation with a mode spacing of the free spectral range of the cavity. Unlike the conventional multiple resonant photon pair generation experiments, the photon pair generation was incessant within a range of 80 nm without missing teeth due to a mismatch of the energy conservation and the cavity resonance condition of the photons, resulting in over 1000-mode frequency multiplexed photon pairs in this range.
关键词： frequency multiplexed photon pair generation,photon pair generator,PPLN waveguide,quadratic nonlinear optical waveguide,singly resonant configuration
更新于2025-09-12 10:27:22
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High-resolution and fast-response optical waveguide temperature sensor using asymmetric Mach-Zehnder interferometer structure
摘要： We propose and demonstrate a high-resolution and fast-response optical waveguide temperature sensor based on asymmetric Mach-Zehnder interferometer (MZI) structure. The sensing region is composed of an asymmetric MZI structure, which consists of two different kinds of cores formed with commercial polymer materials EpoClad and Norland optical adhesive 73 (NOA 73), respectively, in the two arms. Due to the higher thermo-optic coefficient of NOA 73, the phase changes of the two MZI arms are different with the temperature which in turn induces output optical power variations, enabling simple and real-time temperature detection. The sensor exhibits a large sensitivity of ?1.685 ?C?1, high resolution of 1.48 × 10?3 ?C and fast response time of about 510 (cid:2)s. The advantages of high sensitivity and resolution, low-cost, competent integration and compatible with most biological assays make the designed sensor potential application in temperature detections of molecular analysis, biotechnology and chemical synthesis.
关键词： Mach-Zehnder interferometer,Polymer material,Thermo-optical effect,Optical waveguide sensor
更新于2025-09-12 10:27:22
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PT-symmetric transverse mode splitting in coupled quantum cascade lasers
摘要： Separation of transverse modes in waveguides typically achieved by manipulating mode effective indices is of current interest in integrated optics and various designs have been proposed. Recently, implementation of non-Hermitian optics under parity time (PT) symmetry has led to an alternate class of devices employing gain and loss media with far reaching results. Introduction of PT symmetry to non-Hermitian systems results in real solutions while symmetry breaking results in imaginary eigenvalues. However, applications of PT symmetry in the infrared devices is quite limited. In this work, we demonstrate a mode splitter that can separate transverse modes in coupled PT symmetric in realistic quantum cascade lasers (QC lasers). We study the effects of gain and loss for coupled PT symmetric QC laser waveguides and show that TE0 and TE1 modes can be separated with proper choice of gain and loss values.
关键词： quantum cascade lasers,parity-time symmetry,photonic devices,optical waveguide,optical systems,Mode splitter
更新于2025-09-12 10:27:22
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Semiconductor Laser Quasi-Array with Phase-Locked Single-Mode Emitting Channels
摘要： The construction of a semiconductor laser with a stripe waveguide is proposed, the geometry of which can make it possible to obtain radiation similar to that of a phase-locked laser array. The requirements for the parameters of the laser quasi-array and the technological feasibility of the proposed approach are discussed.
关键词： diode laser,phase-locked laser array,directional pattern,optical waveguide
更新于2025-09-12 10:27:22
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Morphology‐Dependent Luminescence and Optical Waveguide Property in Large‐Size Organic Charge Transfer Cocrystals with Anisotropic Spatial Distribution of Transition Dipole Moment
摘要： Organic cocrystals exhibiting active optical waveguide behaviors are strongly related to the total internal reflection, molecule stacking modes, and the spatial distribution of transition dipole moment (μ) in crystals. However, organic charge transfer (CT) cocrystals as new materials that exhibit optical waveguide property responses to anisotropic spatial distribution of μ are still unknown. Herein, prepared is a novel organic CT cocrystal 9AC-TCNB (9AC = 9-anthracene carboxylic acid, TCNB = 1,2,4,5-tetracyanobenzene) with a mixed stacking structure of donor (D) and acceptor (A) along two different orientations on the same lattice plane. According to various spectroscopic analyses, two direction-oriented asymmetric light propagate in the cocrystal derived from the anisotropic spatial distribution of μ have been confirmed. Photo luminescence (PL) microscopic images and spatial resolution PL spectra of 1D and 2D 9AC-TCNB cocrystals further demonstrate that the CT cocrystals possess morphology and color-dependent optical waveguide properties with anisotropy, which confirms the principle theory of light propagation. This result can open new potential applications of organic cocrystals in large-scale optical waveguide devices and integrated optics.
关键词： large-size organic cocrystals,charge transfer,optical waveguide,transition dipole moment
更新于2025-09-12 10:27:22
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-symmetric periodic structures of one-dimensional two-material optical waveguide networks
摘要： In this paper, we construct a PT -symmetric periodic structure with one-dimensional two-material waveguide networks and primarily investigate re?ectionlessness. The formation conditions for re?ectionlessness is presented in terms of the incident wave frequency and the number of unit cells. We show that, for this optical system, the orientation of unidirectional re?ectionlessness can be controlled by tuning the spacing between waveguides with loss and gain. We also show the energy distribution when re?ectionless light propagates through this PT -symmetric optical structure. Finally, we ?nd that unidirectional invisibility of the PT -symmetric periodic structure could be achieved easily by adjusting the number of unit cells. Our results could be potentially important for developing a new generation of functional optical devices with singular directional responses.
关键词： re?ectionlessness,unidirectional invisibility,PT -symmetric,optical waveguide networks
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Optical Resonances in a 3D Superlattice of Photonic Band Gap Cavities
摘要： The confinement of light in three dimensions (3D) is an active research topic in Nanophotonics, since it allows for ultimate control over photons [1]. A powerful tool to this end is a 3D photonic band gap crystal with a tailored defect that acts as a cavity or even a waveguide [2]. When a one-dimensional array of cavities is coupled, an intricate waveguiding system appears, known as a CROW (coupled resonator optical waveguide) [3]. Remarkably, 3D superlattices of coupled cavities that resonate inside a 3D band gap have not been studied to date. Recently, theoretical work has predicted the occurrence of “Cartesian light”, wherein light propagates by hopping only in high symmetry directions in space [4]. This represents the optical analog of the Anderson model for spins or electrons that is relevant for neuromorphic computing and may lead to intricate lasing [5]. To experimentally study the propagation of light in a 3D superlattice of band gap cavities, we have fabricated 3D nanostructures from silicon by reactive ion etching (see Fig. 1). The photonic crystal has the cubic diamond-like inverse woodpile structure that is composed of two perpendicular sets of pores (in the X and Z directions) [6] and that reveals a broad 3D photonic band gap. By intentionally making two proximal perpendicular pores smaller, light is confined at their intersection, thus forming a cavity [7]. By fabricating two arrays of defect pores (see Fig. 1) we realize a 3D cavity superlattice. The challenge we address here is to experimentally identify resonances in this complex system. We measure reflectivity of the crystals with a large aperture (NA = 0.85) for both s and p-polarizations. With our setup we also record lateral scattered light, i.e., light that is input in the Z-direction, scattered, and detected in the X-direction. In presence of the intentional defects, we observe troughs in the stop band in reflectivity. The corresponding lateral scattering spectrum shows peaks in the stopband at the same frequencies as the reflectivity troughs, see Fig. 2. To distinguish cavity resonances from random speckle, we record several spectra at different locations on the crystal. Peaks reproducing at the same frequencies are attributed to light scattered from the cavity resonances. The appearance of the scattering peaks strongly depends on polarization in conformity with numerical calculations [7]. We now extend the numerical work to the range of pore sizes probed experimentally.
关键词： nanophotonics,Cartesian light,3D photonic band gap,cavity superlattice,coupled resonator optical waveguide
更新于2025-09-12 10:27:22
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[IEEE 2018 IEEE CPMT Symposium Japan (ICSJ) - Kyoto (2018.11.19-2018.11.21)] 2018 IEEE CPMT Symposium Japan (ICSJ) - Fabrication and Evaluation for Polymer Waveguide Coupler Devices Using the Imprint Method
摘要： For further increase of data rate in multimode fiber (MMF) links widely deployed in datacenters, wavelength division multiplexing (WDM) transmission technology is expected to be introduced. In this paper, we propose a Y-branched polymer waveguide with graded-index core for optical coupler in the MMF WDM links. The low loss structure of the Y-branched polymer waveguide is designed applying BPM simulation, and designed waveguide structures are actually fabricated using an imprint method to confirm their applicability to a low-loss optical coupler in MMF WDM links.
关键词： Y branched polymer optical waveguide,optical coupler,Imprint Method,multimode fiber link,Beam propagation method
更新于2025-09-11 14:15:04