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Non-destructive OAM measurement via light-matter interaction

Light(Science & Applications) 2022年第3期11卷 10-12页

作者： gianluca ruffato Department of Physics and Astronomy‘G.Galilei’ University of PadovaPadovaItaly Quantum Technologies Research Center(QTech) University of PadovaPadovaItaly

The detection of orbital angular momentum usually relies on optical techniques,which modify the original beam to convert the information carried on its phase into a specific intensity distribution in ***,the exploitation of high-intensity beams can result destructive for standard optical elements and setups.A recent publication suggests a solution to overcome all those limitations,by probing highly-intense vortex pulses with a structured reference beam in a strong-field photoionization process.

关键词： beam overcome interaction

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OAM-inspired new optics:the angular metalens

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Light(Science & Applications) 2021年第6期10卷 944-946页

作者： gianluca ruffato Department of Physics and Astronomy‘G.Glilei’ Universitof PadovaPadovaItaly

Analogous to the behavior of a common converging lens for the input of tilted waves,a recent publication suggests a new optical element with an azimuthal-quadratic phase profile for the focusing of orbital angular momentum beams at distinct angular *** realization in a metasurface form enables the combined measurement of orbital and spin angular momentum using a single optical component.

关键词： angular momentum orbital

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Multiplication and division of the orbital angular momentum of light with diffractive transformation optics

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Light(Science & Applications) 2019年第1期8卷 111-123页

作者： gianluca ruffato Michele Massari Filippo Romanato Department of Physics and Astronomy‘G.Galilei’ University of Padovavia Marzolo 835131 PadovaItaly LaNN Laboratory for Nanofabrication of NanodevicesEcamRicertCorso StatiUniti 435127 PadovaItaly CNR-INFM TASC IOM National Laboratory S.S.14 Km 163.534012 TriesteItaly

We present a method to efficiently multiply or divide the orbital angular momentum(OAM)of light beams using a sequence of two optical *** key element is represented by an optical transformation mapping the azimuthal phase gradient of the input OAM beam onto a circular *** combining multiple circular-sector transformations into a single optical element,it is possible to multiply the value of the input OAM state by splitting and mapping the phase onto complementary circular ***,by combining multiple inverse transformations,the division of the initial OAM value is achievable by mapping distinct complementary circular sectors of the input beam into an equal number of circular phase *** elements have been fabricated in the form of phase-only diffractive optics with high-resolution electron-beam *** tests confirm the capability of the multiplier optics to perform integer multiplication of the input OAM,whereas the designed dividers are demonstrated to correctly split up the input beam into a complementary set of OAM *** elements can find applications for the multiplicative generation of higher-order OAM modes,optical information processing based on OAM beam transmission,and optical routing/switching in telecom.

关键词： optics circular complementary

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Surface Plasmon Polaritons Excitation and Propagation on Metallic Gratings： Far-Field and Near-Field Numerical Simulations

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材料科学与工程（中英文A版） 2011年第6期1卷 768-777页

作者： gianluca ruffato Gabriele Zacco Filippo Romanato Department of Physics ＂G. Galilei＂ Padova University Padova 35131 Italy LaNN Laboratory for Nanofabrication of Nanodevices VenetoNanotech Padova 35127 Italy IOM CNR TASC Laboratory Area Science Park Basovizza 34012 Trieste Italy

Metallic gratings are known to support the excitation and propagation of electromagnetic surface modes, the so called Surface Plasmon Polaritons (SPPs). Patterned metallic substrates have been nanofabricated by interferential lithography and subsequent thermal evaporation, and their plasmonic response has been analyzed in the visible range. A numerical code was implemented in order to simulate SPP excitation and propagation on the structure. In recent papers, we experimentally demonstrated how the azimuthal rotation of the grating originates an unexpected polarization phenomenology and provides benefits for plasmonic applications. Numerical simulations confirm the experimental results and complete the analysis with a study of the plasmonic near-field on the metallic surface in the conical mounting.

关键词：表面等离子体激元数值模拟金属光栅元激发传播近场最高人民检察院远场

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