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您的检索式：作者名="Avan Majeed"
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| 1 | Broadband THz absorption spectrometer based on excitonic nonlinear optical effects显示文摘A broadly tunable THz source is realized via difference frequency generation,in which an enhancement to χ^((3)) that is obtained via resonant excitation of III–V semiconductor quantum well excitons is utilized.The symmetry of the quantum wells(QWs)is broken by utilizing the built-in electric-field across a p-i-n junction to produce effectiveχ(2)processes,which are derived from the high χ^((3)).This χ^((2)) media exhibits an onset of nonlinear processes at~4Wcm−2,thereby enabling area(and,hence,power)scaling of the THz emitter.Phase matching is realized laterally through normal incidence excitation.Using two collimated 130mW continuous wave(CW)semiconductor lasers with ~1-mm beam diameters,we realize monochromatic THz emission that is tunable from 0.75 to 3 THz and demonstrate the possibility that this may span 0.2-6 THz with linewidths of ~20 GHz and efficiencies of ~1×10^(-5),thereby realizing ~800 nW of THz power.Then,transmission spectroscopy of atmospheric features is demonstrated,thereby opening the way for compact,low-cost,swept-wavelength THz spectroscopy. | Avan Majeed Pavlo Ivanov Benjamin Stevens Edmund Clarke Iain Butler David Childs Osamu Kojima Richard Hogg | 2019 | Light(Science & Applications)2019，8，1： | 0 |
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