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The passive near-field microscope probes thermal evanescent waves derived from local dynamics on surfaces. Here we study dielectric samples, whose surface phonon resonances are close to the detection wavelength. GaAs and SiC show finite near-field signals due to thermal phonons, which decay rapidly from the surface. On the other hand, GaN and AlN show very unique characteristics, derived from phonon...
Our passive near-field microscope probes thermal evanescent waves due to local phenomena on material's surface. With the microscope, we study dielectric samples since they have surface phonon resonances whose resonance wavelengths are very close to our detection wavelength. From the results, GaAs, SiC, and AlN show reasonable signals due to thermal fluctuations, whereas GaN show very unique characteristics...
A film of poly(l-lactic acid) (PLLA) consisting of highly oriented α crystals was uniaxially drawn by tensile force. The effects of the draw ratio (DR), draw temperature (T d ), and draw stress on the crystal/crystal transformation from the α- to the β-form crystals were studied. At the initial stage of drawing, the highly oriented α crystals of the starting film transformed into a broader...
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