INVESTIGADORES
MARTINEZ Oscar Eduardo
artículos
Título:
Focus error detection device for thermal expansion-recovery microscopy (ThERM)
Autor/es:
E. DOMENÉ; O.E. MARTÍNEZ
Revista:
REVIEW OF SCIENTIFIC INSTRUMENTS
Editorial:
AMER INST PHYSICS
Referencias:
Lugar: New York; Año: 2013 vol. 84 p. 1 - 3
ISSN:
0034-6748
Resumen:
An innovative focus error detectionmethod is presented that is only sensitive to surface curvature variations, canceling both thermoreflectance and photodefelection effects. The detection scheme consists of an astigmatic probe laser and a four-quadrant detector. Nonlinear curve fitting of the defocusing signal allows the retrieval of a cutoff frequency, which only depends on the thermal diffusivity of the sample and the pump beam size. Therefore, a straightforward retrieval of the thermal diffusivity of the sample is possible with microscopic lateral resolution and high axial resolution (∼100 pm).
