Measurement apparatus of vectorial optical fields
An apparatus measures the transverse profile of vectorial optical field beams, including at least the directional intensity complex amplitude, the phase and the polarization spatial profile. The apparatus contains a polarization separation module, a weak perturbation module, and a detection module. Characterizing the transverse profile of vector fields provides an optical metrology tool for both fundamental studies of vectorial optical fields and a wide spectrum of applications, including microscopy, surveillance, imaging, communication, material processing, and laser trapping.
1. A computerized method of transmitting information via an optical vector beam, the method comprising:
encoding the data onto a primary optical beam to form the optical vector beam, wherein the encoding comprises differential spatial phase shift keying (DSPSK) in which the data is represented by physical changes in the optical vector beam across spatially separated portions of the optical vector beam;
decoding the data by identifying respective directional complex intensity amplitudes, polarization states and respective phase measurements for the spatially separated portions of the optical vector beam by:
(i) selecting, from the spatially separated portions of the optical vector beam, at least two orthogonally polarized portions of the optical vector beam; and
(ii) identifying the data in the optical vector beam by tracking differences between the respective directional intensity complex amplitudes for the at least two orthogonally polarized of the optical vector beam.
2. The computerized method of claim 1 , wherein encoding the data onto the primary optical beam comprises:
directing the primary optical beam to at least one of a first spatial light modulator, a second spatial light modulator, and a third spatial light modulator.
3. The computerized method of claim 2 , wherein encoding the data onto the primary optical beam comprises encoding with a single selected input mode having a selected directional intensity complex amplitude.
4. The computerized method of claim 3 , wherein encoding the data onto the primary optical beam comprises encoding with a multi-dimensional input mode.