Rotated waveplates in integrated waveguide optics

Giacomo Corrielli, Andrea Crespi, Riccardo Geremia, Roberta Ramponi, Linda Sansoni, Andrea Santinelli, Paolo Mataloni, Fabio Sciarrino () and Roberto Osellame ()
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Giacomo Corrielli: Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche (IFN-CNR)
Andrea Crespi: Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche (IFN-CNR)
Riccardo Geremia: Politecnico di Milano
Roberta Ramponi: Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche (IFN-CNR)
Linda Sansoni: Sapienza Università di Roma
Andrea Santinelli: Sapienza Università di Roma
Paolo Mataloni: Sapienza Università di Roma
Fabio Sciarrino: Sapienza Università di Roma
Roberto Osellame: Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche (IFN-CNR)

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Controlling and manipulating the polarization state of a light beam is crucial in applications ranging from optical sensing to optical communications, both in the classical and quantum regime, and ultimately whenever interference phenomena are to be exploited. In addition, many of these applications present severe requirements of phase stability and greatly benefit from a monolithic integrated-optics approach. However, integrated devices that allow arbitrary transformations of the polarization state are very difficult to produce with conventional lithographic technologies. Here we demonstrate waveguide-based optical waveplates, with arbitrarily rotated birefringence axis, fabricated by femtosecond laser pulses. To validate our approach, we exploit this component to realize a compact device for the quantum state tomography of two polarization-entangled photons. This work opens perspectives for integrated manipulation of polarization-encoded information with relevant applications ranging from integrated polarimetric sensing to quantum key distribution.

Date: 2014
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DOI: 10.1038/ncomms5249

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