Metasurfaces integrated with waveguides have been recently explored as a means to control the conversion between guided modes and radiation modes for versatile functionali-ties. However, most efforts have been limited...
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Metasurfaces integrated with waveguides have been recently explored as a means to control the conversion between guided modes and radiation modes for versatile functionali-ties. However, most efforts have been limited to constructing a single free-space wavefront using guided waves, which hinders the functional diversity and requires a complex con-figuration. Here, a new, to the best of our knowledge, type of non-uniformly arranged geometric metasurface enabling independent multi-channel wavefront engineering of guided wave radiation is ingeniously proposed. By endowing three structural degrees of freedom into a meta-atom, two mech-anisms (the Pancharatnam-Berry phase and the detour phase) of the metasurface are perfectly joined together, giv-ing rise to three phase degrees of freedom to manipulate. Therefore, an on-chip polarization demultiplexed metal-ens, a wavelength-multiplexed metalens, and RGB-colored holography with an improved information capacity are successively demonstrated. Our results enrich the function-alities of an on-chip metasurface and imply the prospect of advancements in multiplexing optical imaging, augmented reality (AR) holographic displays, and information encryp-tion. & COPY;2023 Optica Publishing Group
A packaged power detector made in a waveguide with a standard cross section of 2.4 x 1.2 mm(2) for the three-millimeter wavelength range with good enough matching for this type of device is presented. The design uses ...
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A packaged power detector made in a waveguide with a standard cross section of 2.4 x 1.2 mm(2) for the three-millimeter wavelength range with good enough matching for this type of device is presented. The design uses low-barrier diodes made on the structure of domestic production. The calculated and experimental characteristics of the detectors are given, such as the frequency dependence of the sensitivity and the level of the standing wave ratio (SWR). It is shown that the average sensitivity of the detectors over the range is more than 1000 V/W, and the SWR value is no more than 3.
proposed a new variety of substrate integrated plasmonic filters (SIPFs) with multiple passband characteristics based on the concept of spoof surface plasmon polaritons (SSPPs). By etching a periodic interdigital stru...
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proposed a new variety of substrate integrated plasmonic filters (SIPFs) with multiple passband characteristics based on the concept of spoof surface plasmon polaritons (SSPPs). By etching a periodic interdigital structure array on the top metal layer of substrate integrated waveguide (SIW), we can achieve high-efficiency microwave SSPP transmission with an insertion loss of 1 dB in the passband of 7.4-12.5 GHz, and a high rejection level of 27 dB in the rejection bands. By introducing antisymmetric C-ring resonators (ASCRs) in the filter structure, the passband number and bandwidth of the filter can be flexibly manipulated. To validate the proposed design, four SSPP filters prototypes are fabricated and tested, showing good filtering performances with a high transmission coefficient (S21>-1 dB) and low reflection coefficient (S11 <-12 dB) in their passbands, and a high rejection level over 15 dB between them. By changing the geometric parameters of ASCR, the number of passbands can be increased from 1 to 3, and the passband center frequency and bandwidth can be engineered accordingly. The proposed SSPP filters with good multiple passband characteristics may have great potential applications in microwave wireless integrated plasmonic circuits and communication systems.
Superoscillation refers to a phenomenon where a band -limited wave locally oscillates faster than its highest Fourier component. Current research on optical superoscillations predominantly lies on the basis of free-sp...
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Superoscillation refers to a phenomenon where a band -limited wave locally oscillates faster than its highest Fourier component. Current research on optical superoscillations predominantly lies on the basis of free-space waves. As the optical waveguides play a key role in energy and information transportation, guided waves with precisely controlled deep-subwavelength features offers unprecedented flexibility for applications. In this Letter, we numerically show that, by superimposing eigenmodes of a multimode SiO2 waveguide and forcing the resultant field to pass through a set of pre-determined points, superoscillatory fields in various shapes can be formed in preset cross-sectional planes. Furthermore, by padding prescribed intensities in multiple cross sections, we successfully create a persistent superoscillatory saddle. (c) 2023 Optica Publishing Group it allows out beat of light cial configurations, The used superoscillation cal microscopy extended pulsation for
We investigate the heat conduction between two one- dimensional waveguides intermediated by a laser-driving atom. The laser provides the optical control of the heat conduction. The tunable asymmetric conduction of the...
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We investigate the heat conduction between two one- dimensional waveguides intermediated by a laser-driving atom. The laser provides the optical control of the heat conduction. The tunable asymmetric conduction of the heat against the temperature gradient is realized. Assisted by the modulated laser, the heat conduction from either waveguide to the other waveguide can be suppressed. The heat currents can be significantly amplified by the energy flow of the laser.(c) 2023 Optica Publishing Group
In the last decade, waveguide thermoelectric power sensors have been established as an alternative to thermistor mounts for millimeter wave power standards, and due to the detection principle and the nature of wavegui...
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In the last decade, waveguide thermoelectric power sensors have been established as an alternative to thermistor mounts for millimeter wave power standards, and due to the detection principle and the nature of waveguides, the generalized efficiency is used as calibration quantity instead of the effective efficiency. In this paper, the generalized efficiency and the measurement uncertainty of waveguide thermoelectric sensors are presented and applied to calibrate other types of power sensors in a measurement set-up for frequency up to 170 GHz. Results for commercially available waveguide power sensors are discussed for the interfaces R 900 and R 1.4k.
This paper presents the experimental activities carried out within Institute for Nuclear Research from Pitesti for the ultrasonic characterization of liquid lead, candidate as nuclear coolant of advanced nuclear energ...
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PurposeKretschmann-configuration has been used as a subwavelength framework to detect tiny left-to-right markalterations of the refractive index of biomaterials. However, most of the theoretical assessment of such con...
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PurposeKretschmann-configuration has been used as a subwavelength framework to detect tiny left-to-right markalterations of the refractive index of biomaterials. However, most of the theoretical assessment of such configuration left-to-right markis usually based on the plane wave excitation transfer matrix method (TMM) of prism-left-to-right markcoupled to thin metal film supporting plasmonic modes. Accordingly, a better theoretical framework left-to-right markthan the plane wave approximation is indispensable for reliable and accurate assessments and left-to-right marksimulations. A reformulated form of the traditional FFT-BPM has been adapted to evaluate the performance and characteristics of surface plasmonic waveguide *** plasmon mode is excited by a sub-wavelength narrow light beam. The highly confined optical energy of that plasmonic mode enables an left-to-right markefficient means to detect tiny variations in the composition of left-to-right markthe analyte in contact with the metallic layer of the surface plasmon left-to-right markguide. The plasmonic guided power is detected thereafter electronically via an optical MOS *** guided plasmonic power has been used to assess the fundamental characteristics and performance of the sensor, namely the linearity, sensitivity, and figure of merit as well as the full width at half maximum (FWHM).ConclusionThe proposed sensor could be integrated to a wide class of angular measurement system (for instance goniometer) or via electronic detection of the optical plasmonic guided power. we claim that this work is worthy of being shared with researchers and left-to-right markdevelopers interested in the experimentation and assessment of sensitive biosensors;especially in left-to-right markcase when complicated and sophisticated analysis tools represent an unpleasant burden.
The paper describes results of the numerical simulation and experimental characterization of plasmonic gratings and waveguides in the optical range of 1520-1630 nm. Gold structures were coated with a 630-nm thick tetr...
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The paper describes results of the numerical simulation and experimental characterization of plasmonic gratings and waveguides in the optical range of 1520-1630 nm. Gold structures were coated with a 630-nm thick tetraethylorthosilicate layer to achieve higher coupling efficiency for plasmonic gratings using lensed optical probes. We experimentally demonstrated gold input/output plasmonic gratings with an efficiency of about -3.8 +/- 0.2 dB per grating. The measured loss of the plasmonic mode propagating over the surface of the gold waveguide was 0.14 +/- 0.02dB/mu m. The work was carried out with the aim of studying integrated plasmonic structures for the development of a hybrid photonic-plasmonic integrated technology
We describe a leaky-wave antenna based on a parallel-plate metal waveguide, suitable for use in the terahertz range. The emission from the antenna is highly directional. It can be controlled by shaping the waveguide p...
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ISBN:
(纸本)9781479982721
We describe a leaky-wave antenna based on a parallel-plate metal waveguide, suitable for use in the terahertz range. The emission from the antenna is highly directional. It can be controlled by shaping the waveguide plates, for engineering of terahertz wave fronts.
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