This paper will demonstrate an 18 aperture Digital Adaptive Optics system imaging through laboratory-controlled turbulence. Comparisons to a standard imaging system, with data that was captured simultaneously under the exact same conditions, will be shown. System performance relative to increasing turbulence strength will be quantified using QR codes as an imaging metric.
In this work we theoretically propose a novel method towards obtaining a two-dimensional beam steering system which could be used for LIDAR applications. The method utilizes a hybrid plasmonic waveguide in a cylindrical topology creating a nanoscale vertical cavity surface emitting phaseshifter (VCSEP). This approach enables a sub-wavelength spacing between each phase shifter and therefore provides a larger field of view. Each VCSEP consists of a highly doped sub-micron silicon pillar coated with a thin layer of non-linear material then another layer of conductive metal. The input optical carrier is inserted from the polished back side of the silicon substrate, which is then modulated by the phase shifter and re-emitted in the vertical direction to form a beam in the far field. The hybrid plasmonic localization increases the effective interaction length of the light with the non-linear material within a silicon core resonant cavity. Increased interaction length due to plasmonic effects in the vertical architecture leads to an enhanced phase shift. A lower loss is possible while retaining high localization due to an overlap of photonic mode and plasmonic modes. The impedance mismatch between the vertical hybrid plasmonic waveguide and free space will create a low finesse, low-Q cavity resonator. The single VCSEP device can be considered as a low finesse Fabry-Perot resonator that can be used for phase modulation with less than 3dB amplitude modulation. We characterized the optical response of a single VCSEP, with an aspect ratio of 12.5 which has an FSR of 47.25±2.5nm and transmission variation of 3dB.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.