Share Email Print
cover

Proceedings Paper

Integrated optical waveplates fabricated by femtosecond laser micromachining
Author(s): G. Corrielli; A. Crespi; R. Geremia; R. Ramponi; L. Sansoni; A. Santinelli; P. Mataloni; F. Sciarrino; R. Osellame
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

The application of integrated photonic technologies to quantum optics has recently enabled a wealth of breakthrough experiments in several quantum information areas. In particular, femtosecond laser written optical circuits revealed to be the ideal tool for investigating the features of polarization encoded qubits. However, the difficulty of integrating half and quarter wave plates in such circuits avoids the possibility to perform arbitrary rotations of the polarization state of photons on chip. Femtosecond laser written waveguides intrinsically exhibit a certain degree of birefringence and thus they could be exploited as integrated waveplates. In practice, the direction of the birefringence axes of the waveguides is the same of the propagation direction of the writing femtosecond laser beam, namely perpendicular to the substrate surface. Its fine rotation in a controlled fashion, preserving the accuracy of the positioning of the laser focal spot required by the fabrication process, is extremely challenging. In order to achieve this goal, we combine a high NA (1.4) focusing objective partially filled with a reduced diameter writing beam. In this way, the translation of the beam with respect to the objective center produces a rotation of the focusing direction, without altering the focal spot position. With this method we are able to tilt the birefringence axes of the waveguides up to 45°, and thus to use them as integrated light polarization rotators. In order to demonstrate the effectiveness of these components, we developed a fully integrated device capable to perform the quantum tomography of an arbitrary two-photon polarization state.

Paper Details

Date Published: 7 March 2014
PDF: 7 pages
Proc. SPIE 8972, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIV, 89720X (7 March 2014); doi: 10.1117/12.2039673
Show Author Affiliations
G. Corrielli, Politecnico di Milano (Italy)
A. Crespi, Istituto di Fotonica e Nanotecnologie, CNR (Italy)
R. Geremia, Politecnico di Milano (Italy)
R. Ramponi, Istituto di Fotonica e Nanotecnologie, CNR (Italy)
L. Sansoni, Univ. degli Studi di Roma La Sapienza (Italy)
A. Santinelli, Univ. degli Studi di Roma La Sapienza (Italy)
P. Mataloni, Univ. degli Studi di Roma La Sapienza (Italy)
F. Sciarrino, Univ. degli Studi di Roma La Sapienza (Italy)
R. Osellame, Istituto di Fotonica e Nanotecnologie, CNR (Italy)


Published in SPIE Proceedings Vol. 8972:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIV
Alexander Heisterkamp; Peter R. Herman; Michel Meunier; Stefan Nolte, Editor(s)

© SPIE. Terms of Use
Back to Top