0000000000092822

AUTHOR

Jalil Ali

showing 6 related works from this author

Exact reconstruction of thz sub-λ source features in knife-edge measurements

2013

The spatial features of a sub-wavelength terahertz source are not accessible using time-integrated knife-edge techniques due to the non-separable space-time nature of the radiated field and to systematic modifications induced by the blade itself. We show that combining knife-edge with a time resolved electro-optical sampling, the space-time coupling can be addressed and the source field profile can be exactly reconstructed.

PhysicsCouplingPhase-sensitive field characterizationBlade (geometry)Terahertz radiationbusiness.industrySettore ING-INF/02 - Campi ElettromagneticiEdge (geometry)Lambdasubwavelength sourceSettore ING-INF/01 - ElettronicaSource fieldAtomic and Molecular Physics and OpticsOpticsSampling (signal processing)subwavelength sourcesspatiotemporal field characterizationElectrical and Electronic EngineeringTime-resolved spectroscopybusinessterahertz (THz) sources
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Affordable, ultra-broadband coherent detection of terahertz pulses via CMOS-compatible solid-state devices

2017

We demonstrate the first fully solid-state technique for the coherent detection of ultra-broadband THz pulses (0.1-10 THz), relying on the electric-field-induced second-harmonic generation attained in integrated CMOS-compatible devices.

Materials sciencebusiness.industryTerahertz radiationSpectral densitySecond-harmonic generationSettore ING-INF/02 - Campi Elettromagnetici02 engineering and technology021001 nanoscience & nanotechnologySettore ING-INF/01 - Elettronica01 natural sciencesElectromagnetic radiationTerahertz spectroscopy and technologyOpticsNonlinear optics Ultrafast optics Far infrared or terahertz Solid state detectorsElectric field0103 physical sciencesBroadbandOptoelectronicsHeterodyne detection010306 general physics0210 nano-technologybusinessConference on Lasers and Electro-Optics
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Space-time features of THz emission from optical rectification in sub-wavelength areas

2011

We present our investigation on the THz space-time emission characteristic induced by the non-paraxial generation regime in highly localized THz generation via optical rectification on sub-wavelength areas.

Materials sciencebusiness.industryTerahertz radiationPhysics::OpticsNonlinear opticsTeraHertz science and deviceSettore ING-INF/01 - ElettronicaTerahertz spectroscopy and technologyOptical pumpingOptical rectificationOpticsRectificationMicroscopyOptoelectronicsNear-field scanning optical microscopebusiness
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Asymmetric Dual-Grating Micro-Slit Configuration for Broadband Solid State Coherent Detection of THz Pulses

2016

We demonstrated solid-state broadband coherent Terahertz characterization based on the Terahertz Field Induced Second Harmonic effect in Silica. The THz detector consists of an asymmetric micro-slit array which can be operated at 200V applied bias.

Materials scienceField (physics)business.industryTerahertz radiationSolid-statePhysics::Optics02 engineering and technologyGrating021001 nanoscience & nanotechnology01 natural sciencesSlitTerahertz spectroscopy and technology0103 physical sciencesBroadbandHarmonicOptoelectronics010306 general physics0210 nano-technologybusiness
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Spatio-temporal Characteristics of THz Emission at the Subwavelength Scale via Optical Rectification

2011

Highly localized THz emission via optical rectification in thin nonlinear crystals is a promising method for subwavelength microscopy. We present here the peculiar THz spatio-temporal characteristics induced by the non-paraxial generation regime.

WavefrontMaterials scienceScale (ratio)Terahertz radiationbusiness.industryNear-field opticsPhysics::OpticsPhysics::Classical PhysicsSettore ING-INF/01 - Elettronicaterahertz nonlinear opticsOptical rectificationOpticsMicroscopyOptoelectronicsNear-field scanning optical microscopebusinessImage resolutionAdvanced Photonics
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Solid-state-biased coherent detection of ultra-broadband terahertz pulses

2017

Significant progress in nonlinear and ultrafast optics has recently opened new and exciting opportunities for terahertz (THz) science and technology, which require the development of reliable THz sources, detectors, and supporting devices. In this work, we demonstrate the first solid-state technique for the coherent detection of ultra-broadband THz pulses (0.1-10 THz), relying on the electric-field-induced second-harmonic generation in a thin layer of ultraviolet fused silica. The proposed CMOS-compatible devices, which can be realized with standard microfabrication techniques, allow us to perform ultra-broadband detection with a high dynamic range by employing probe laser powers and bias v…

coherent detectionTA1501Nonlinear opticTerahertzFar infrared or terahertzFour-wave mixingUltrafast opticDevicePhysics::OpticsUltrafast laserSolid state detectorSettore ING-INF/01 - ElettronicaQC0350Optica
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