Probing electron induced defects in CaF2 by photothermal displacement
نویسندگان
چکیده
The surface displacement technique is used to measure the temperature and frequency dependence of the periodic expansion of a CaF2-surface subject to a modulated focused beam of lkeV electrons. Theoretical models are presented for a prediction of the observed phenomena based on thermal transport and defect lifetime effects. The use of such investigations for the study of thermal and non-thermal transport phenomena in alkaline-earth halides is discussed.
منابع مشابه
Study structural and up-conversion luminescence properties of polyvinyl alcohol/CaF2:erbium nanofibers for potential medical applications
Objective(s): This paper describes synthesisPolyvinyl Alcohol/CaF2:Er nanofibers because of its photoluminescence properties.Materials and Methods: First, CaF2:Er nanocomposite synthesized with co-precipitation method. In order to prepare polyvinyl alcohol (PVA)/CaF2:Er nanofibers, CaF2:Er nanocomposites were added to the polyvinyl alcohol (PVA) polymer. PVA/CaF2:Er composite nanofibers were...
متن کاملDirect probing of carrier motion and interfacial phenomena in organic films and devices by optical second harmonic generation and Maxwell- displacement-current
Probing and modelling of dynamical motions of carriers in organic materials is a fundamental research subject in science and electronics. According to the Maxwell’s electromagnetic field theory, electrons and dipoles are source of electric fields. As a result organic materials surrounding electrons and dipoles are polarized. By probing the dielectric polarization, we can visualize carrier motio...
متن کاملLow-power photothermal probing of single plasmonic nanostructures with nanomechanical string resonators.
We demonstrate the direct photothermal probing and mapping of single plasmonic nanostructures via the temperature-induced detuning of nanomechanical string resonators. Single Au nanoslits and nanorods are illuminated with a partially polarized focused laser beam (λ = 633 nm) with irradiances in the range of 0.26-38 μW/μm(2). Photothermal heating maps with a resolution of ∼375 nm are obtained by...
متن کاملتابع توزیع سه بعدی دمای لیزر القاییده در طیف نمایی جابجایی گرما نوری
In this paper we present a detailed theoretical treatment of the 3-D temperature distribution induced by laser beam in photothermal displacement spectroscopy. We assume that a solid sample, which is deposited on a substrate and is in contact with a fluid, is irradiated by an intensity modulated cw laser source. By using a technique based on Greens function and integral transformations we find...
متن کاملElectron spin resonance and optical characterization of defects in microcrystalline silicon
Electron spin resonance (ESR), constant photocurrent method (CPM), photothermal de ̄ection spectroscopy (PDS), Raman and IR spectroscopy have been used to measure microcrystalline silicon ®lms. Besides standard defects with a g-value of 2.0055, new defects with a g-value 2.0030 have been created during annealing this material. Proportionality between the subgap optical absorption and ESR spin de...
متن کامل