We report on an advancement to leaky-mode modulators that allows for backside emission from the device. This is accomplished by adding a high spatial frequency surface relief grating (~300 nm period) to the backside of the modulator. The outcome being a theoretical arbitrary increase in usable output aperture, at the cost of angular deflection. Using backside emission, it is now possible for leaky mode modulators to be used to create transparent, holographic, direct-view near-eye displays.
Holovideo displays are based on light-bending spatial light modulators. One such spatial light modulator is the anisotropic leaky mode modulator. This modulator is particularly well suited for holographic video experimentation as it is relatively simple and inexpensive to fabricate. Some additional advantages of leaky mode devices include: large aggregate bandwidth, polarization separation of signal light from noise, large angular deflection and frequency control of color. In order to realize these advantages, it is necessary to be able to adequately characterize these devices as their operation is strongly dependent on waveguide and transducer parameters. To characterize the modulators, the authors use a commercial prism coupler as well as a custom characterization apparatus to identify guided modes, calculate waveguide thickness and finally to map the device's frequency input and angular output of leaky mode modulators. This work gives a detailed description of the measurement and characterization of leaky mode modulators suitable for full-color holographic video.
Surface Dielectric Barrier Discharges (SDBDs) have been gaining interest in recent years for numerous applications. One of the advantages of SDBDs is their scalability and flexibility of materials used, allowing larger electrodes than simple linear electrodes investigated in earlier works. This paper seeks to elucidate the properties of more complicated SDBD geometries utilizing differing repeated lattice structures. Voltage and current traces, optical emission spectroscopy, digital imaging, and numerical analysis are used to analyze the electrodes. Reduced electric fields obtained through optical emission spectroscopy and the total power deposited into the plasma are presented. The reduced electric field is not significantly affected by increasing applied voltage, but minor variations could be observed due to the geometry of the electrode lattice structures. Finally, it was observed that plasma power is not a simple linear relationship in these more complicated lattice structures. Smaller lattice structures were observed to have lower energy deposited per period.
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