Dark-field Z-scan imaging technique

Hongzhen Wang (1) , Christophe Cassagne (1) , Hervé Leblond (1) , Georges Boudebs (1)

1 LPHIA - Laboratoire de Photonique d'Angers

We report on Dark-Field Z-scan (DFZ-scan) as a new imaging technique combining Z-scan method with Dark-field microscopy in order to measure optical refraction nonlinearity. Numerical and experimental results are provided to validate this concept. The image of the induced phase shift is spatially resolved without introducing a complex interferometric setup. Moreover, the experimental results show almost 3 times increase of the sensitivity when compared to the conventional Z-scan method. New perspective of microscope laser scanning is introduced.

Mots clés: Dark-field microscopy; Phase object; Third-order nonlinearity; Z-scan

Domaines: Optique [physics.optics]

Hongzhen Wang, Christophe Cassagne, Hervé Leblond, Georges Boudebs. Dark-field Z-scan imaging technique. Optics Communications, 2016, 366, pp.148-153. ⟨10.1016/j.optcom.2015.12.035⟩. ⟨hal-01388773⟩