High-order correlations from rough-surface scattering

Gu, Zu-Han

doi:10.1364/ao.43.003061

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…Laser speckle analysis has been used in the past as a surface roughness characterization technique [23][24][25] , and it was found that different scattering processes give rise to distinct speckle correlation lengths. Multiple scattering processes can be differentiated from single or weak scattering processes through the intensity or field statistics 18,19 .…”

Section: Resultsmentioning

confidence: 99%

“…Near the MIT transition temperature, a secondary peak develops away from the central maximum region, as seen most prominently in Fig 4(a) and (b) at T = 57 °C for an illumination wavelength 633 nm and at a slightly higher temperature of 59 °C for 800 nm. The secondary maxima are a signature of long range correlation, which indicates a decreased scattering mean free path 25 and increased scattering strength. Additional small maxima at different positions are also noticeable at temperatures 61 °C for 800 nm and 62 °C for 633 nm.…”

Section: Resultsmentioning

confidence: 99%

“…Below we discuss an expanded analysis using second order intensity statistics.While first order intensity statistics allow one to extract the roughness of the dielectric landscape, second order intensity statistics such as autocorrelation analysis is very sensitive to small variations in speckle sizes. Speckle correlation function coefficients depend on the distribution of the dielectric constant at the surface, with the spatial resolution for roughness features being constrained by the diffraction limit 17,23,24,25 . The autocorrelation function thus provides an independent spatial analysis of the dominant length scales present in each speckle pattern which are related to the morphology of the dielectric landscape on the VO 2 surface.…”

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confidence: 99%

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Resolving transitions in the mesoscale domain configuration in VO2 using laser speckle pattern analysis

Seal

Sharoni

Messman

et al. 2014

Sci Rep

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The configuration and evolution of coexisting mesoscopic domains with contrasting material properties are critical in creating novel functionality through emergent physical properties. However, current approaches that map the domain structure involve either spatially resolved but protracted scanning probe experiments without real time information on the domain evolution, or time resolved spectroscopic experiments lacking domain-scale spatial resolution. We demonstrate an elegant experimental technique that bridges these local and global methods, giving access to mesoscale information on domain formation and evolution at time scales orders of magnitude faster than current spatially resolved approaches. Our straightforward analysis of laser speckle patterns across the first order phase transition of VO2 can be generalized to other systems with large scale phase separation and has potential as a powerful method with both spatial and temporal resolution to study phase separation in complex materials.

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