Abstract
Synthetic optical holography (SOH) is a recent technique introduced in scanning microscopy to record amplitude and phase of a scattered field from a sample at nanoscale. In this work, we describe a compact implementation realized in optical fiber and working at infrared wavelength. The system is based on a scanning extrinsic optical microcavity and combines the low-coherence properties of the infrared laser source with the resonant behavior of a micro-cavity, in order to realize a high sensitive imaging system. Measurements were performed over a nanometric SiO2 grating, achieving a lateral resolution of about 1 pm by means of an optical fiber with a Numerical Aperture (NA) equal to 0.1 and a Mode Field Diameter (MDF) of 5.6 pm.
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