Two-dimensional photonic quasicrystals by single beam computer-generated holography

Author(s): Gianluigi Zito, Bruno Piccirillo, Enrico Santamato, Antigone Marino, Volodymyr Tkachenko, and Giancarlo Abbate

Abstract:

“Recently important efforts have been dedicated to the realization of a new kind of photonic crystals, known as photonic quasicrystals, in which the lack of the translational symmetry is compensated by rotational symmetries not achievable by the conventional periodic crystals. Here we show a novel approach to their fabrication based on the use of a programmable Spatial Light Modulator encoding Computer-Generated Holograms. Using this single beam technique we fabricated Penrose-tiled structures possessing rotational symmetry up to 23-fold, and a two-dimensional Thue-Morse structure, which is an aperiodic structure not achievable by multiple beam holography.”

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Publication: Optics Express
Issue/Year: Optics Express, Vol. 16, Issue 8, pp. 5164-5170, 2008
DOI: 10.1364/OE.16.005164

Full phase and amplitude control of holographic optical tweezers with high efficiency

Author(s): Alexander Jesacher, Christian Maurer, Andreas Schwaighofer, Stefan Bernet, and Monika Ritsch-Marte

Abstract:

“Recently we demonstrated the applicability of a holographic method for shaping complex wavefronts to spatial light modulator (SLM) systems. Here we examine the potential of this approach for optical micromanipulation. Since the method allows one to shape both amplitude and phase of a trapping light field independently and thus provides full control over scattering and gradient forces, it extends the possibilities of commonly used holographic tweezers systems. We utilize two cascaded phase-diffractive elements which can actually be display side-by-side on a single programmable phase modulator. Theoretically the obtainable light efficiency is close to 100%, in our case the major practical limitation arises from absorption in the SLM. We present data which demonstrate the ability to create user-defined “light pathways” for microparticles driven by transverse radiation pressure.”

Link to Publications Page

Publication: Optics Express
Issue/Year: Optics Express, Vol. 16, Issue 7, pp. 4479-4486, 2008
DOI: 10.1364/OE.16.004479