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We examine the possibility that optical vortices should offer a controllable specificity in their interactions with chiral matter, associated with orbital angular momentum transfer. By explicit analysis of the grounds for chiroptical behaviour, we establish that the helicity of optical vortices cannot engage through any parametric or non-parametric optical process with the chirality of a molecular...
All-optical, mirrorless switching is demonstrated with bacteriorhodopsin (bR) film using a very simple geometry. A low-power, 532 nm laser beam modulates the transmission of a cw laser beam at 635 nm, a wavelength that corresponds to peak absorption of the O-excited state in the bR photocycle. The switching contrast depends on the pulse width and average power of the modulating laser. Varying the...
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