Qixin Shen
Duke University
Polarization (waves)ResonanceGraphene foamPlasmonSpontaneous emissionRangingAnalytical chemistryPhase (waves)OpticsPhysicsDielectricMulti-band deviceNanomaterialsGraphene nanoribbonsBilayer grapheneOrders of magnitude (time)Phase transitionSurface plasmon polaritonNonlinear systemHyperspectral imagingPhotonUltrashort pulseFinite-difference time-domain methodNanostructureBilayerMaterials scienceElectron-beam lithographyGraphene oxide paperEnergy conversion efficiencyScanning electron microscopePurcell effectDiamondFrequency conversionOptical antennaActive controlGold filmNonlinear opticalVanadium dioxideGrapheneThird harmonicSecond-harmonic generationChemical engineeringNear-infrared spectroscopyOptoelectronicsChemical vapor depositionAbsorption (electromagnetic radiation)Electric fieldMonolayerNonlinear opticsExcitationResonator
10Publications
5H-index
32Citations
Publications 10
Newest
#1Qixin ShenH-Index: 5
Last. Maiken H. MikkelsenH-Index: 22
view all 7 authors...
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#1Andrew M. Boyce (Duke University)H-Index: 2
#2Jon W. Stewart (Duke University)H-Index: 4
Last. Maiken H. Mikkelsen (Duke University)H-Index: 22
view all 6 authors...
Actively tunable optical materials integrated with engineered subwavelength structures could enable a new generation of optoelectronic devices with low power consumption for on-chip hyperspectral focal plane arrays or optical beam steering. Phase-change materials, such as vanadium dioxide (VO2), are a promising solid-state solution for dynamic tuning; however, previous demonstrations have focused on VO2 films with >50 nm thickness, limiting their use in e.g. optical memory devices. Here we integ...
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#1Qixin Shen (Duke University)H-Index: 5
#2Weiliang Jin (Princeton University)H-Index: 20
Last. Maiken H. Mikkelsen (Duke University)H-Index: 22
view all 5 authors...
Plasmonic structures are promising to enhance and control nonlinear optical processes as the subwavelength-scale elements not only increase the local electric field intensities, but also result in relaxed phase matching conditions. This opens the possibility to observe and further manipulate multiple nonlinear optical processes simultaneously, which would be forbidden in bulk crystals due to incompatible phase matching requirements. Here we enhance and control the relative strength between third...
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#1Guoce Yang (THU: Tsinghua University)H-Index: 6
#2Qixin Shen (Duke University)H-Index: 5
Last. Hong-Bo Sun (THU: Tsinghua University)H-Index: 89
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#1Qixin Shen (Duke University)H-Index: 5
#2Andrew M. Boyce (Duke University)H-Index: 2
Last. Maiken H. Mikkelsen (Duke University)H-Index: 22
view all 4 authors...
Metasurfaces are ultrathin, two-dimensional arrays of subwavelength resonators, which can possess optical properties unobtainable naturally. One such desirable property is dual-band absorption occurring at the same spatial location, which could enable the enhancement of multiple processes simultaneously. However, demonstrations of multiband absorption to date have been limited to the mid-infrared and microwave regimes. Here, metasurfaces are demonstrated to have spatially overlapped, dual-band a...
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#1Qixin Shen (Duke University)H-Index: 5
#2Thang B. Hoang (Duke University)H-Index: 25
Last. Maiken H. Mikkelsen (Duke University)H-Index: 22
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We investigate the mechanism of highly efficient nonlinear responses from dielectric materials in a tiny gap of less than 7 nm between a gold film and metallic nanostructures, which offers potential for on-chip nonlinear devices.
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#1Qixin Shen (Duke University)H-Index: 5
#2Thang B. Hoang (Duke University)H-Index: 25
Last. Maiken H. Mikkelsen (Duke University)H-Index: 22
view all 5 authors...
Plasmonic structures can precisely localize electromagnetic energy to deep subwavelength regions resulting in significant field enhancement useful for efficient on-chip nonlinear generation. However, the origin of large nonlinear enhancements observed in plasmonic nanogap structures consisting of both dielectrics and metals is not fully understood. For the first time, here we probe the third harmonic generation (THG) from a variety of dielectric materials embedded in a nanogap plasmonic cavity. ...
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#1Xiaozhi Xu (PKU: Peking University)H-Index: 18
#2Chenfang Lin (PKU: Peking University)H-Index: 9
Last. Hongyun Li (PKU: Peking University)H-Index: 1
view all 15 authors...
Selective growth of either monolayer or bilayer graphene is of great importance. We developed a method to readily tune large area graphene growth from complete monolayer to complete bilayer. In an ambient pressure chemical vapor deposition process, we used the sample temperature at which to start the H2 flow as the control parameter and realized the change from monolayer to bilayer growth of graphene on Cu foil. When the H2 starting temperature was above 700°C, continuous monolayer graphene film...
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