
1.Department of Physics and Astronomy 'G. Galilei', University of Padova, via Marzolo 8, 35131 Padova, Italy
2.LaNN, Laboratory for Nanofabrication of Nanodevices, EcamRicert, Corso StatiUniti 4, 35127 Padova, Italy
3.CNR-INFM TASC IOM National Laboratory, S.S. 14 Km 163.5, 34012 Trieste, Italy
Gianluca Ruffato (gianluca.ruffato@unipd.it)
Published:2019,
Published Online:05 December 2019,
Received:12 April 2019,
Revised:05 November 2019,
Accepted:11 November 2019
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Ruffato, G., Massari, M. & Romanato, F. Multiplication and division of the orbital angular momentum of light with diffractive transformation optics. Light: Science & Applications, 8, 1098-1110 (2019).
Ruffato, G., Massari, M. & Romanato, F. Multiplication and division of the orbital angular momentum of light with diffractive transformation optics. Light: Science & Applications, 8, 1098-1110 (2019). DOI: 10.1038/s41377-019-0222-2.
We present a method to efficiently multiply or divide the orbital angular momentum (OAM) of light beams using a sequence of two optical elements. The key element is represented by an optical transformation mapping the azimuthal phase gradient of the input OAM beam onto a circular sector. By 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 sectors. Conversely
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 gradients. Optical elements have been fabricated in the form of phase-only diffractive optics with high-resolution electron-beam lithography. Optical 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 beams. These 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.
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