0000000000724692

AUTHOR

Amin Moazami

showing 3 related works from this author

A broadband multifocal metalens in the terahertz frequency range

2016

Abstract Metasurfaces, the 2D form of metamaterials with their ability in phase, amplitude and polarization manipulation are widely used in designing optical devices. Efforts to find proper photonic components in the terahertz (THz) range of frequency lead us to adopt metasurfaces as their constituent elements. Here, we conceived a broadband THz lens with an adjustable number and arrangement of focal points. To have a full control over the lens functionality, we used a metasurface with the capability of simultaneously modulating the amplitude and phase of the incident wave. C-shaped ring resonators (CSRRs) with different geometry and orientation capable of simultaneously manipulating phase …

Physicsbusiness.industryTerahertz radiationPhysics::OpticsMetamaterial02 engineering and technology021001 nanoscience & nanotechnologyPolarization (waves)01 natural sciencesAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic Materials010309 opticsResonatorAmplitudeOpticsCardinal point0103 physical sciencesBroadbandOptoelectronicsElectrical and Electronic EngineeringPhysical and Theoretical ChemistryPhotonics0210 nano-technologybusinessOptics Communications
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Amplitude modulation technique for designing metalenses with apodized and enhanced resolution focal spots

2017

Abstract In this paper we show that engineering both phase and amplitude of the scattered light can be employed in designing metalenses with either higher resolution or apodized focal spots. C-shaped split-ring micro-resonators (CSRRs) with different geometrical parameters are selected to have a full control of amplitude and phase. While phase engineering is necessary for light focusing, amplitude modulation of the scattered wave can be applied to characterize the focal point properties such as resolution gain and sidelobe level. We show that both axial and transverse resolution improvement or apodization is possible in the far-field region by applying proper amplitude function. Amplitude m…

PhysicsFocal pointbusiness.industryResolution (electron density)Astrophysics::Instrumentation and Methods for AstrophysicsPhase (waves)02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic Materials010309 opticsAmplitude modulationAmplitudeOpticsApodization0103 physical sciencesElectrical and Electronic EngineeringPhysical and Theoretical Chemistry0210 nano-technologybusinessLithographyPhase modulationOptics Communications
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Metalenses with high-NA, enhanced resolution and apodization

2017

Dielectric microlenses employed in imaging and focusing for optoelectronics are currently prospects to be substituted by metalenses showing an extraordinary optical performance within notably reduced volumes. Here we present some proposals to achieve an enhanced resolution in metallodielectric metasurface-based lenses established on either efficient arrangements with high numerical aperture or spatial filtering enabling to surpass the limit of resolution derived by the Rayleigh criterion.

Materials scienceSpatial filterbusiness.industryResolution (electron density)Physics::Optics02 engineering and technologyDielectric01 natural sciences010309 opticsAmplitude modulation020210 optoelectronics & photonicsOpticsApodization0103 physical sciences0202 electrical engineering electronic engineering information engineeringOptoelectronicsHigh numerical aperturebusinessOptical filterImage resolution2017 19th International Conference on Transparent Optical Networks (ICTON)
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