Eli Janzen
Kansas State University
SemiconductorAnalytical chemistryOpticsPhysicsvan der Waals forcePolaritonCathodoluminescenceMicroscopyElectronLuminescenceAqueous two-phase systemChemical compositionInfrared spectroscopyResidualInfraredWavefrontInterferometryTotal internal reflectionExcitonBand gapAtomic physicsChemistryScatteringMaterials scienceTrigonal crystal systemImage resolutionMolecular vibrationPhononCondensed matter physicsBoron nitrideNano-Electromagnetic fieldNear field imagingInfrared microscopyMid infraredHexagonal boron nitrideSpectroscopyThermal expansionSpectral lineOptoelectronicsCrystalKinetic isotope effectImpurityRadiative transferCrystallographyExcitationPhotoluminescence
9Publications
1H-index
8Citations
Publications 9
Newest
Using a new time-resolved cathodoluminescence system dedicated to the UV spectral range, we present a first estimate of the radiative lifetime of free excitons in hBN at room temperature. This is carried out from a single experiment giving both the absolute luminescence intensity under continuous excitation and the decay time of free excitons in the time domain. The radiative lifetime of indirect excitons in hBN is equal to 27 ns, which is much shorter than in other indirect bandgap semiconducto...
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#14Gennady ShvetsH-Index: 68
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#1Qiran Cai (Deakin University)H-Index: 18
#2Eli Janzen (KSU: Kansas State University)H-Index: 1
Last. Lu Hua Li (Deakin University)H-Index: 40
view all 7 authors...
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#2Andrei BylinkinH-Index: 7
Last. Rainer Hillenbrand (UPV/EHU: University of the Basque Country)H-Index: 73
view all 6 authors...
Polaritons allow for strong light-matter coupling and for highly sensitive analysis of (bio)chemical substances and processes. Nanoimaging of the polaritons' evanescent fields is critically important for experimental mode identification and field confinement studies. Here we describe two setups for polariton nanoimaging and spectroscopy in liquid. We first demonstrate the mapping of localized plasmon polaritons in metal antennas with a transflection infrared scattering-type scanning near-field o...
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#1Haomin Wang (Lehigh University)H-Index: 31
#2Le Wang (Lehigh University)H-Index: 8
Last. Xiaoji G. Xu (Lehigh University)H-Index: 17
view all 5 authors...
Total internal reflection (TIR) infrared spectroscopy is a convenient measurement tool for collecting spectra for chemical identification. However, TIR infrared microscopy lacks high spatial resolution due to the optical diffraction limit and difficulty to preserve a high-quality wave front for focus. In this article, we present the peak force infrared microscopy in the TIR geometry to achieve a 10 nm spatial resolution. Instead of optical detection, photothermal responses of the sample are coll...
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#2Andrei BylinkinH-Index: 7
Last. Rainer HillenbrandH-Index: 73
view all 6 authors...
Localized and propagating polaritons allow for highly sensitive analysis of (bio)chemical substances and processes. Nanoimaging of the polaritons evanescent fields allows for critically important experimental mode identification and for studying field confinement. Here we describe two setups for polariton nanoimaging and spectroscopy in liquid, which is an indispensable environment for (bio)chemical samples. We first demonstrate antenna mapping with a transflection infrared scattering-type scann...
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#1Haomin Wang (Lehigh University)H-Index: 31
#2Eli Janzen (KSU: Kansas State University)H-Index: 1
Last. Xiaoji G. Xu (Lehigh University)H-Index: 17
view all 5 authors...
Phonon polaritons (PhPs), the collective phonon oscillations with hybridized electromagnetic fields, concentrate optical fields in the mid-infrared frequency range that matches the vibrational modes of molecules. The utilization of PhPs holds the promise for chemical sensing tools and polariton-enhanced nanospectroscopy. However, investigations and innovations on PhPs in the aqueous phase remains stagnant, because of the lack of in situ mid-infrared nano-imaging methods in water. Strong infrared...
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