- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Ultra-Low Power Tuning in Hybrid Barium Titanate-Silicon Nitride Electro-Optic Devices on Silicon
摘要： As the optical analogue to integrated electronics, integrated photonics has already found widespread use in data centers in the form of optical interconnects. As global network traffic continues its rapid expansion, the power consumption of such circuits becomes a critical consideration. Electrically-tunable devices in photonic integrated circuits contribute significantly to the total power budget as they traditionally rely on inherently power-consuming phenomena such as the plasma dispersion effect or the thermo-optic effect for operation. Here, we demonstrate ultra-low power refractive index tuning in a hybrid barium titanate (BTO)-silicon nitride (SiN) platform integrated on silicon. We achieve tuning by exploiting the large electric field-driven Pockels effect in ferroelectric BTO thin films of sub 100 nm thickness. The extrapolated power consumption for tuning a free spectral range (FSR) in racetrack resonator devices is only 106 nW/FSR, several orders of magnitude less than many previous reports. We demonstrate the technological potential of our hybrid BTO-SiN technology by compensating thermally-induced refractive index variations over a temperature range of 20 °C and by using our platform to fabricate tunable multi-resonator optical filters. Our hybrid BTO-SiN technology significantly advances the field of ultra-low power integrated photonic devices and allows for the realization of next-generation efficient photonic circuits for use in a variety of fields, including communications, sensing, and computing.
关键词： ferroelectric,Pockels effect,silicon nitride,electro-optic,barium titanate,integrated photonics,optical tuning
更新于2025-09-16 10:30:52
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Phenomenological studies of femtosecond laser ablation on optical thin films for integrated photonics
摘要： In this work, we present a well-supported procedure to fabricate ridge optical waveguides onto thin films of PLZT by femtosecond laser ablation. To achieve smooth-guiding structures that guarantee good optical performance we have studied the characteristics of ablation threshold for different kinematic conditions of fs laser machining and we have also explored the different ablation regimens for several fluences reached. Furthermore, we characterized the morphology and roughness of ridge waveguides through a modal analysis of scattering loss for waveguides conducted by single and multiple scans. An innovative phenomenological model that describes the sidewall roughness to process parameters is proposed in this paper. With this approach, it is possible to extend the manufacturing method of smooth-guiding structures to many optical thin films by fs micromachining, so as to create integrated photonics devices that can be addressed to different technological applications.
关键词： Thin films,Integrated photonics,Laser materials processing,Optical waveguides,Femtosecond laser ablation
更新于2025-09-16 10:30:52
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[IEEE 2019 International Workshop on Fiber Optics in Access Networks (FOAN) - Sarajevo, Bosnia and Herzegovina (2019.9.2-2019.9.4)] 2019 International Workshop on Fiber Optics in Access Networks (FOAN) - Concept of PIC Packaging with Microwave, DC and Fiber Array Ports
摘要： Progress integrated photonics enables development of integrated photonics circuits with new unique properties, circuits of the future, and overcomes current limits in information and communication technologies. The packaging of photonic integrated circuits is necessary for taking them out of research laboratories into real implementation in the information and communication technology applications. Telecom optical fibers are still being the best transmission medium of digital data and analogue signals for long distance applications. The effective coupling of optical radiation between telecom optical fiber with ten microns core dimension and photonic integrated circuits optical waveguides with submicron dimensions are necessary. To address these challenges, we present our concept of photonics integrated circuit packaging with radio frequency, direct current and fiber array ports with automated active alignment system.
关键词： packaging,photonics integrated circuits,information and communication technology,concept,integrated photonics
更新于2025-09-12 10:27:22
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Optical Modulation in Hybrid Waveguide based on Si-ITO Heterojunction
摘要： An Optical modulator based on a hybrid optical waveguide made up of Silicon and Indium Tin Oxide (ITO) is proposed. The hybrid waveguide is created by the coupling of a leaky optical mode guided in silicon with ITO. The optical modulation is realized with the heterojunction between p-type silicon and n-type ITO. The presence of ITO causes electrical tuning in permittivity and in imaginary-part of the refractive index which provide a way to modulate the intensity of the guide optical mode. The device with Si-ITO heterojunction is fabricated to show intensity modulation at 1.55μm wavelength. To achieve an efficient optical modulation the carrier concentration of ITO is optimized by depositing ITO on p-type Si wafer at different oxygen partial pressures using Ion assisted electro-beam deposition. The fabricated device exhibiting an extinction ratio of 7 dB for 1.7mm long device at low voltage of -5 volts.
关键词： Integrated photonics,Optical Modulation,Intensity modulator,Silicon ITO photonics
更新于2025-09-12 10:27:22
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Waveguide-integrated, plasmonic enhanced graphene photodetectors
摘要： We present a micrometer scale, on-chip integrated, plasmonic enhanced graphene photodetector (GPD) for telecom wavelengths operating at zero dark current. The GPD is designed to directly generate a photovoltage by the photo-thermoelectric effect. It is made of chemical vapor deposited single layer graphene, and has an external responsivity～12.2V/W with a 3dB bandwidth～42GHz. We utilize Au split-gates to electrostatically create a p-n-junction and simultaneously guide a surface plasmon polariton gap-mode. This increases light-graphene interaction and optical absorption and results in an increased electronic temperature and steeper temperature gradient across the GPD channel. This paves the way to compact, on-chip integrated, power-ef?cient graphene based photodetectors for receivers in tele and datacom modules.
关键词： plasmonics,graphene,integrated photonics,photo-thermoelectric effect,photodetectors
更新于2025-09-12 10:27:22
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Metasurface-Integrated Photonic Platform for Versatile Free-Space Beam Projection with Polarization Control
摘要： Densely integrated photonic circuits enable scalable, complex processing of optical signals, including modulation, multiplexing, wavelength conversion, and detection. Directly interfacing such integrated circuits to free-space optical modes will enable novel optical functions, such as chip-scale sensing, interchip free-space interconnect and cooling, trapping, and interrogation of atoms. However, doing this within the limits of planar batch fabrication requires new approaches for bridging the large mode scale mismatch. Here, by integrating a dielectric metasurface with an extreme photonic mode converter, we create a versatile nanophotonic platform for efficient coupling to arbitrary-defined free-space radiation of 780 nm wavelength with well-controlled spatially-dependent polarization, phase, and intensity. Without leaving the chip, the high index photonic mode is converted first to a ～ 200 μm wide, precisely collimated, linearly-polarized Gaussian beam, which is then modified by a planar, integrated, low-loss metasurface. We demonstrate high numerical aperture, diffraction limited focusing to an ～ 473 nm spot at an ～ 75 μm working distance, and combine it with simultaneous conversion from linear to elliptical polarization. All device components are lithographically defined and can be batch fabricated, facilitating future chip-scale low-cost hybrid photonic systems for bio-sensing, nonlinear signal processing and atomic quantum sensing, frequency references and memory.
关键词： photonic-free-space coupling,free-space radiation,Integrated photonics,metasurface,high-NA focusing,polarization control
更新于2025-09-12 10:27:22
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Femtosecond Laser Written Depressed-Cladding Waveguide 2 × 2, 1 × 2 and 3 × 3 Directional Couplers in Tm3+:YAG Crystal
摘要： Ion-doped crystal-based compact devices capable of beam splitting and coupling are enthralling for a broad range of classical and quantum integrated photonics applications. In this work, we report on the fabrication of depressed-cladding waveguide 2D 2×2, 1×2 and 3D 3×3 directional couplers in Tm3+:YAG crystal by femtosecond laser writing. The performances of the couplers are characterized at 810 nm, showing single-mode guidance, polarization independence, ?nely matched splitting ratios. These results open up new opportunities in the bene?cial fabrication of 3D circuits and devices in crystals.
关键词： crystal,femtosecond laser writing,directional coupler,depressed-cladding waveguide,integrated photonics,yttrium aluminum garnet,quantum memory
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) - Third Harmonic Generation in Highly-Doped Silica Glass Micro Ring Resonator
摘要： The paper discusses the green emission generation in a highly doped silicon ring resonator with core input power. It explores the first observation of green emission by third-harmonic generation in a silicon ring resonator, highlighting the potential for integrated photonic applications.
关键词： green emission,silicon ring resonator,integrated photonics,third-harmonic generation
更新于2025-09-12 10:27:22
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Generation of a frequency-degenerate four-photon entangled state using a silicon nanowire
摘要： Integrated photonics is becoming an ideal platform for generating two-photon entangled states with high brightness, high stability, and scalability. This high brightness and high quality of photon pair sources encourages researchers further to study and manipulate multiphoton entangled states. Here, we experimentally demonstrate frequency-degenerate four-photon entangled state generation based on a single silicon nanowire 1 cm in length. The polarization encoded entangled states are generated with the help of a Sagnac loop using additional optical elements. The states are analyzed using quantum interference and state tomography techniques. As an example, we show that the generated quantum states can be used to achieve phase super-resolution. Our work provides a method for preparing indistinguishable multi-photon entangled states and realizing quantum algorithms in a compact on-chip setting.
关键词： silicon nanowire,frequency-degenerate,Integrated photonics,four-photon entangled state,quantum algorithms
更新于2025-09-11 14:15:04
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Semi-Nonlinear Nanophotonic Waveguides for Highly Efficient Second-Harmonic Generation
摘要： Quadratic optical parametric processes form the foundation for various applications related to classical and quantum frequency conversion, and have attracted significant interest recently in on-chip implementation. These processes rely on phase matching among the interacting guided modes, and refractive index engineering is a primary approach for this purpose. Unfortunately, modal phase-matching approaches developed so far only produce parametric generation with fairly low efficiencies, due to the intrinsic modal mismatch of spatial symmetries. Here, a universal design and operation principle is proposed for highly efficient optical parametric generation on integrated photonic platforms. By breaking the spatial symmetry of the optical nonlinearity of the device, nonlinear parametric interactions can be dramatically enhanced. This principle is then employed to design and fabricate a heterogeneous titanium oxide/lithium niobate nanophotonic waveguide that is able to offer second-harmonic generation with a theoretical normalized conversion efficiency as high as 2900% W?1 cm?2, which enables the measurement of an experimental efficiency of 650% W?1 cm?2, significantly beyond the reach of conventional modal phase-matching approaches. Unlike nonlinearity domain engineering that is material selective, the proposed operation principle can be flexibly applied to any other on-chip quadratic nonlinear platform, to support ultra-highly efficient optical parametric generation.
关键词： lithium niobate,integrated photonics,nonlinear optics,optical parametric generation
更新于2025-09-11 14:15:04