Mese: settembre 2016

Bessel beams through disordered curtains

bessel

Bessel beams are nondiffractive light structures extensively exploited in life science and for technological applications.

Here we demonstrate how to build a Bessel beam through a disordered, strongly scattering curtain enabling to extend a large set of investigation techniques through opaque media.We exploit a form of spectral filtering which allows transforming  standard speckle pattern into a disorganized superposition of interfering Bessel beams named  amorphous speckle pattern.  Then by exploiting  adaptive focusing we are able to build constructive interference at a user selected target, which results in a Bessel beam itself.