- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2019 International Conference on Optical MEMS and Nanophotonics (OMN) - Daejeon, Korea (South) (2019.7.28-2019.8.1)] 2019 International Conference on Optical MEMS and Nanophotonics (OMN) - Hybrid Dielectric Metasurfaces: From Strong Light-Matter Interaction to Extreme Nonlinearities
摘要： We experimentally demonstrate strong coupling between Mie modes of dielectric resonators in a metasurface and intersubband transitions in semiconductor quantum wells that are embedded inside the resonator. The ability to achieve such light-matter coupling creates the possibility to realize ultrathin nonlinear optical devices that are free from complex phase matching requirements and have very high nonlinear conversion efficiencies.
关键词： Rabi splitting,Intersubband transitions,Nonlinear optics,Semiconductor heterostructures,Metasurface
更新于2025-09-16 10:30:52
-
[IEEE 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Paris, France (2019.9.1-2019.9.6)] 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Terahertz Near-field Metasurfaces and Superfocusing
摘要： In this work, a near-field metasurface is designed to overcome diffraction limit and superfocus terahertz waves by elaborately arranging the proposed unit cells with super small electric sizes. The full width at half-maximum beam width reaches up to 0.067λ0 (free-space wavelength) at a distance of 0.073λ0 at 0.437 THz. The near-field metasurface is beneficial for subwavelength resolution imaging, photolithography, non-contact sensing, and other applications in the near field.
关键词： subwavelength resolution,terahertz,near-field metasurface,superfocusing
更新于2025-09-16 10:30:52
-
Photonic bands, superchirality, and inverse design of a chiral minimal metasurface
摘要： Photonic band structures are a typical fingerprint of periodic optical structures, and are usually observed in spectroscopic quantities such as transmission, reflection, and absorption. Here we show that the chiro-optical response of a metasurface constituted by a lattice of non-centrosymmetric, L-shaped holes in a dielectric slab shows a band structure, where intrinsic and extrinsic chirality effects are clearly recognized and connected to localized and delocalized resonances. Superchiral near-fields can be excited in correspondence to these resonances, and anomalous behaviors as a function of the incidence polarization occur. Moreover, we have introduced a singular value decomposition (SVD) approach to show that the above mentioned effects are connected to specific fingerprints of the SVD spectra. Finally, by means of an inverse design technique we have demonstrated that the metasurface based on an L-shaped hole array is a minimal one. Indeed, its unit cell geometry depends on the smallest number of parameters needed to implement arbitrary transmission matrices compliant with the general symmetries for 2d-chiral structures. These observations enable more powerful wave operations in a lossless photonic environment.
关键词： chirality,polarization,inverse design,metasurface
更新于2025-09-16 10:30:52
-
Broadband Ultrathin Transmission Quarter Waveplate with Rectangular Hole Array Based on Plasmonic Resonances
摘要： The control of the polarization states of light plays an important role in modern optical systems. However, traditional polarization manipulating devices often have narrow bandwidth and their large size makes it difficult for them to achieve miniaturization and integration of optical systems. This work presents an ultrathin quarter waveplate with a periodic silver film 2 × 2 rectangular hole array with a thickness less than λ/50. Numerical simulation shows that the waveplate can efficiently transform a circular polarized wave into a linearly polarized one at the center of 1550 nm, and its bandwidth is 525 nm. Furthermore, the quarter waveplate can efficiently invert linear polarization into circular polarization at 1550 nm, which ellipticity is near unit. With an array of small holes on a metal film to enhance transmission, this structure can increase the transmission to 0.44. The broadband quarter waveplate can be used in communication system and near infrared band system, and be integrated with other optical devices at nanoscale to achieve polarization operation, detection, and sensing.
关键词： Communication band,Polarization,Metasurface,Quarter waveplate,Transmission
更新于2025-09-16 10:30:52
-
Tunable localized surface plasmon graphene metasurface for multiband superabsorption and terahertz sensing
摘要： We propose a plasmon induced tunable metasurface for multiband superabsorption and terahertz sensing. It consists of a graphene sheet that facilitates perfect absorption where the graphene pattern at the top layer creates an enhanced evanescent wave that facilitates the metasurface to work as a sensor. The modelling and numerical analysis are carried out using Finite Element Method (FEM) based software, CST microwave studio where a genetic algorithm (GA) is used to optimize the geometric parameters, and metasurface tunability is achieved via an external gate voltage on the graphene. By exploiting graphene’s tunable properties we demonstrate a multiband superabsorption spectra having a maximum absorption of 99.7% in a frequency range of 0.1–2.0 THz that also maintain unique optical performance over a wide incidence angle. Further results show how the superabsorber can be used as a sensor, where the resonance frequency shifts with the refractive index of the surrounding environment.
关键词： Absorber,Graphene,Terahertz Sensor,Metasurface
更新于2025-09-16 10:30:52
-
[IEEE 2019 49th European Microwave Conference (EuMC) - Paris, France (2019.10.1-2019.10.3)] 2019 49th European Microwave Conference (EuMC) - A 60GHz Wideband Antenna Array Based on Metasurface with Gap Waveguide (GWG) Divider
摘要： A wideband metasurface excited by a 1×2 slot array coupled to a gap waveguide (GWG) is presented. To enhance the matching bandwidth and gain of slot array, quasi-TM30 mode is introduced by 3×3 subwavelength patch matrices. A low cost GWG divider is optimized to obtain low transmission loss, in which electromagnetic bandgap structures are placed on both sides of transmission line. The antenna array is fabricated based on Rogers 4350b.The simulated -10 dB |??????| is from 49.3 GHz to 65 GHz (27%), the measured one is from 48.5 GHz to 64.8 GHz, covering 57 GHz-64 GHz mmW unlicensed band. The maximum gain is 11.8 dB over matching bandwidth.
关键词： mmW antenna array,metasurface,gap waveguide
更新于2025-09-16 10:30:52
-
High-Efficiency and Broadband Near-Infrared Bi-Functional Metasurface Based on Rotary Different-Size Silicon Nanobricks
摘要： Several novel spin-dependent bi-functional metasurfaces consisting of different-sized rotary silicon nanobricks have been proposed and numerically investigated based on the Pancharatnam–Berry phase and structural phase simultaneously. Here, a transmission mechanism is strictly deduced, which can avoid crosstalk from the multiplexed bi-functional metasurface. Four kinds of high-efficiency including a spin-dependent bi-functional beam deflector, a spin-dependent bi-functional metalens, a bi-functional metasurface with spin-dependent focusing and deflection function, and a spin-dependent bi-functional vortex phase plate. All of the results demonstrate the superior performances of our designed devices. Our work opens up new doors toward building novel spin-dependent bi-functional metasurfaces, and promotes the development of bi-functional devices and spin-controlled photonics.
关键词： metalens,metasurface,phase modulation,vortex beam
更新于2025-09-16 10:30:52
-
[IEEE 2019 International Conference on Information and Communication Technology Convergence (ICTC) - Jeju Island, Korea (South) (2019.10.16-2019.10.18)] 2019 International Conference on Information and Communication Technology Convergence (ICTC) - Substrate Integrated Waveguide Antenna with Metasurface for Cube Satellites
摘要： In this paper, the substrate integrated waveguide (SIW) slot array antenna using metasurface for cube satellite is operating sandwiched structure arranging a 2 × 5 periodic square conductor patch on the substrate integrated waveguide. As the surface wave excited in the SIW slot array propagates on the metasurface, additional resonance occurred and the impedance matching was better than the conventional antenna. The overall size of the final antenna was 6.75cm × 2.35cm × 0.37cm (1.07λ × 0.37λ × 0.06λ) at 4.74GHz. The simulated results have a bandwidth of 4.73-4.87 GHz (3.38%) satisfying the condition of |S11| < -10 dB. The maximum realization gain is 6.58 dB at 4.76 GHz.
关键词： Cube Satellite,SIW antenna,Satellite antenna,C-Band,Metasurface
更新于2025-09-16 10:30:52
-
[IEEE 2019 Thirteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) - Rome, Italy (2019.9.16-2019.9.21)] 2019 Thirteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) - Wide Band Polarization Converter Graphene Metasurface for Mid-Infrared Band
摘要： Wide band, insensitive incidence angle graphene metasurface for polarization conversion is introduced in this work. A high Polarization Conversion Ratio (PCR) is verified in Mid-Infrared band by using a graphene as an upper conductor for metasurface. The metasurface construction is composed of a single layer of graphene, which has a half ring slots with rectangular slot connecting between them while the whole shape is rotated with 45o. Silicon dioxide substrate is used with a metal backed ground. The simulation results of the proposed metasurface indicate that a linearly polarized incident wave is converted to a circular polarized one over more than one THz along the Mid-Infrared frequency band. PCR has a maximum value of approximately 98% at 1.45 THz. The polarization conversion ratio is studied for different angles of incidence, with stable value for a wide range of incident angles.
关键词： Insensitive incidence angle,Graphene metasurface,Wide band,Mid-Infrared band,Polarization Conversion Ratio (PCR)
更新于2025-09-16 10:30:52
-
[IEEE 2019 IEEE Research and Applications of Photonics in Defense Conference (RAPID) - Miramar Beach, FL, USA (2019.8.19-2019.8.21)] 2019 IEEE Research and Applications of Photonics in Defense Conference (RAPID) - Graphene Plasmonic Metasurface for Beam Forming and Gas Sensing
摘要： In this paper, we discuss application of tunable plasmon resonance in graphene for design of multi-purpose beam-forming metasurfaces without changing geometric features and dynamic label-free detection of trace gas at terahertz and mid-infrared frequencies.
关键词： metasurface,gas sensing,tunable,plasmonics
更新于2025-09-16 10:30:52