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Fabrication and metrology of lithium niobate narrowband optical filters for the solar orbiter
摘要： We report on the fabrication of custom voltage tunable etalons for the SO/PHI spaceborne solar imaging instrument [A. Gandorfer, S. K. Solanki, J. Woch, V. M. Pillet, A. A. Herrero, and T. Appourchaux, J. Phys.: Conference Series 271, 012086 (2011)]. The etalons were manufactured to place a transmission maximum within 0.3 ? of the FeI emission line at 6175.0 ?. Meeting this specification requires an overall thickness specified to within ±15 nm, over a 60 mm aperture. We describe here the metrology, modelling and coating procedures we developed to achieve this.
关键词： electrooptic,Fabry-Perot,filter,lithium niobate,etalon,solar
更新于2025-09-09 09:28:46
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Hybrid photosensitive structures based on nematic liquid crystals and lithium niobate substrates
摘要： Liquid crystal cells based on lithium niobate substrates have recently been proposed as good candidates for optofluidic devices and for light-induced controlled generation of defects in liquid crystal films. The peculiarity of these structures lies in the possibility of using the bulk photovoltaic effect of lithium niobate to obtain an optically induced dc field able to affect the molecular liquid crystal director. Reversible fragmentation and self-assembling of liquid crystal droplets driven by the lithium niobate pyroelectric properties have also been reported. We review the basic results obtained so far with the aim of making the point and seeing what else can be done in the framework of the realization of hybrid structures combining lithium niobate with the electro-optical and nonlinear optical properties of liquid crystals.
关键词： pyroelectric effect,optofluidic devices,lithium niobate,liquid crystals,photovoltaic effect
更新于2025-09-09 09:28:46
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Processing and characterization of improved congruent lithium niobate
摘要： LiNbO3 exists in two forms: Most commercial devices are inexpensively fabricated from congruent melt that is ca. 1.5% off-stoichiometry. This produces devices of high optical quality for nonlinear optics but also high loss. Stoichiometric lithium niobate also exists, but in smaller more expensive specimens. Here we report the preparation and characterization of low-loss congruent samples. These are shown to be relatively free from extended defects.
关键词： congruent,Raman spectra,defects,lithium niobate,stoichiometric
更新于2025-09-09 09:28:46
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AIP Conference Proceedings [Author(s) INTERNATIONAL CONFERENCE ON INVENTIVE MATERIAL SCIENCE APPLICATIONS: ICIMA-2018 - Tamil Nadu, India (27–28 September 2018)] - An optical millimeter wave generation using carrier suppression modulation scheme based on frequency 12 tupling lithium niobate mach zehnder modulator without an optical filter
摘要： This article presents a novel method for the generation of optical millimeter wave (mmw) from a microwave signal using a single Lithium Niobate Mach Zehnder Modulator (LiNbO3 MZM). The carrier suppression scheme supports the experimental setup for achieving 12-tupling frequency by suppressing the sidebands of wave signal by fixing the modulation and bias voltage as 10V. The absence of optical filter leads to fast tuning of required frequency by the modulator which helps to achieve 12 tupling frequencies effectively. The pseudorandom bit sequence in the rate of 50 Gbps is transmitted through a single mode optical fiber for a distance of 60 km. The experiment achieves a high data rate, less complexity and better performance in the absence of an optical filter and an amplifier when compared to other conventional methods. The proposed method performs error free transmission along the fiber of length 60 km and the efficiency of the generated mmw is analyzed by using optical spectrum, RF spectrum and eye diagram visualizers. The quality factor is also included in the paper using Bit Error Rate (BER) analyzer to prove that the energy loss is negligible in the setup.
关键词： Millimeter wave generation Radio over Fiber,Optical Spectrum,Frequency 12-tupling,Lithium Niobate Mach-Zehnder modulator,Optical carrier suppression
更新于2025-09-04 15:30:14
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AIP Conference Proceedings [Author(s) 4TH ELECTRONIC AND GREEN MATERIALS INTERNATIONAL CONFERENCE 2018 (EGM 2018) - Bandung, Indonesia (27–28 July 2018)] - Physical investigations of nano and micro lithium-niobate deposited by spray pyrolysis technique
摘要： In this paper, lithium-niobate thin films were deposited using spray pyrolysis method. Further investigations of the physical properties of prepared samples were also studied. The spray pyrolysis deposition method was performed over a quartz substrate employing new raw materials as precursor compounds. During the deposition process, a range of annealing temperatures were set to maintain a physical changes in the prepared samples properties. Further, the structural properties were also characterized using field emission scanning electron microscope (FE-SEM), AFM, and film thickness.
关键词： structural properties,Spray pyrolysis,Lithium-Niobate,morphological properties
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Ultra-miniature Dual-band Antenna Based on Subwavelength Resonators on LiNbO3 Substrate
摘要： The common effect of subwavelength resonators and a high-permittivity lithium niobate substrate is used for deep-subwavelength miniaturization of a dual-band S/C-band monopole antenna. The resulting size is just about 1/18th of a wavelength for the lower band.
关键词： subwavelength resonators,ultra-miniature antenna,lithium niobate
更新于2025-09-04 15:30:14
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Electronically programmable photonic molecule
摘要： Physical systems with discrete energy levels are ubiquitous in nature and are fundamental building blocks of quantum technology. Realizing controllable artificial atom- and molecule-like systems for light would enable coherent and dynamic control of the frequency, amplitude and phase of photons. In this work, we demonstrate a ‘photonic molecule’ with two distinct energy levels using coupled lithium niobate microring resonators and control it by external microwave excitation. We show that the frequency and phase of light can be precisely controlled by programmed microwave signals, using concepts of canonical two-level systems including Autler–Townes splitting, Stark shift, Rabi oscillation and Ramsey interference. Through such coherent control, we show on-demand optical storage and retrieval by reconfiguring the photonic molecule into a bright–dark mode pair. These results of dynamic control of light in a programmable and scalable electro-optic system open doors to applications in microwave signal processing, quantum photonic gates in the frequency domain and exploring concepts in optical computing and topological physics.
关键词： topological physics,coherent control,optical computing,microring resonators,lithium niobate,optical storage,microwave excitation,photonic molecule,quantum photonics
更新于2025-09-04 15:30:14