ABSTRACT
We report the design and operation of a surface-emitting surface acoustic wave (SAW) acousto-optical modulator which behaves as a cm-scale linear hologram in response to an applied electronic waveform. The modulator is formed by an optical waveguide, transducer, and out-coupling surface grating on a 1 mm-thick lithium niobate substrate. We demonstrate the ability to load and illuminate a 9-region linear hologram into the modulator's 8 mm-long interaction region using applied waveforms of 280-320 MHz. To the best of the authors' knowledge, this is the first demonstration of a monolithically-integrated, surface-emitting SAW modulator fabricated using lithographic techniques. Applications include practical implementations of a holographic display.
ABSTRACT
Three-dimensional (3-D) visualization technologies have been widely commercialized. These technologies have great potential in a number of telemedicine applications, such as teleconsultation, telesurgery, and remote patient monitoring. This work presents an overview of the state-of-the-art 3-D display devices and related 3-D image/video transmission technologies with the goal of enhancing their utilization in medical applications.
Subject(s)
Imaging, Three-Dimensional/instrumentation , Technology Assessment, Biomedical , Telemedicine/instrumentation , Equipment Design , Humans , Imaging, Three-Dimensional/trends , Telemedicine/trendsABSTRACT
Volumetric 3D displays are frequently purported to lack the ability to reconstruct scenes with viewer-position-dependent effects such as occlusion. To counter these claims, a swept-screen 198-view horizontal-parallax-only 3D display is reported here that is capable of viewer-position-dependent effects. A digital projector illuminates a rotating vertical diffuser with a series of multiperspective 768 x 768 pixel renderings of a 3D scene. Evidence of near-far object occlusion is reported. The aggregate virtual screen surface for a stationary observer is described, as are guidelines to construct a full-parallax system and the theoretical ability of the present system to project imagery outside of the volume swept by the screen.
