Comic Book Convention Brings Thousands of People Millions of Dollars to Houston

first_img Share Listen 00:00 /01:34 To embed this piece of audio in your site, please use this code: X – / 3ComicpaloozaCosplayers at 2015ComicpaloozaOn Friday morning, the George R. Brown Convention Center hasn’t even opened its showroom doors yet, but people are already lining up outside. A lot of them are in full costume, ranging from action heroes to Harry Potter characters.  It’s Comicpalooza, the event that draws people of all levels of comic book fandom.At this point, hundreds of vendors are still in the process of getting their booths set up.Local artist Toni Shelton has been selling her animation prints here for about four years and is bracing for a busy weekend. “Sometimes there are points when (it’s) so packed, you couldn’t walk across the aisle to the next booth… It’s crazy,” she says.“Events like this are really some of the things that are bread and butter for working artists,” says Comicpalooza founder John Simons. “This sort of event gives them an opportunity to promote their own work.”From the convention’s humble beginnings in the lobby of an Alamo Drafthouse in West Houston eight years ago, it’s grown to fill more than one million square feet in the GRB.Nearly 50,000 people attended last year’s convention and Simons expects at least that many this year. It brings some serious cash to the area, according to a survey by the Greater Houston Convention and Visitors Bureau.“Last year, the economic impact was $20 million,” Simons says.Comicpalooza runs through Sunday at the George R. Brown Convention Center in downtown Houston.last_img read more

Highefficiency color holograms created using a metasurface made of nanoblocks

first_img © 2016 Phys.org This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. More information: Bo Wang et al. “Visible-Frequency Dielectric Metasurfaces for Multiwavelength Achromatic and Highly Dispersive Holograms.” Nano Letters. DOI: 10.1021/acs.nanolett.6b02326 (Phys.org)—By carefully arranging many nanoblocks to form pixels on a metasurface, researchers have demonstrated that they can manipulate incoming visible light in just the right way to create a color “meta-hologram.” The new method of creating holograms has an order of magnitude higher reconstruction efficiency than similar color meta-holograms, and has applications for various types of 3D color holographic displays and achromatic planar lenses. Explore further Multicolor meta-hologram produces light across entire visible spectrum Citation: High-efficiency color holograms created using a metasurface made of nanoblocks (2016, July 29) retrieved 18 August 2019 from https://phys.org/news/2016-07-high-efficiency-holograms-metasurface-nanoblocks.htmlcenter_img (Top left) One pixel, which is made of four nanoblocks. (Top right) Experimental setup for generating a color hologram. (Bottom) Experimental results of achromatic color holograms, made of red, green, or blue light or by combining these colors. Credit: Wang et al. ©2016 American Chemical Society Color holographic image made by shining laser light on a metasurface. Credit: Wang et al. ©2016 American Chemical Society The researchers, Bo Wang et al., from Peking University and the National Center for Nanoscience and Technology, both in China, have published a paper on the new type of hologram in a recent issue of Nano Letters.The pixels on the new metasurface consist of three types of silicon nanoblocks whose precise dimensions correspond to the wavelengths of three different colors: red, green, and blue. To enhance the efficiency for the blue light, two identical nanoblocks corresponding to the blue light are arranged in each pixel, along with one nanoblock for red light and one for green light.The researchers explain that each pixel can be thought of as a “meta-molecule” because it is the basic repeating, subwavelength unit of the larger metasurface that constitutes the entire hologram. The meta-molecules enable the metasurface to control light in ways that are not possible without modern nanoscale design.When red, green, and blue lasers illuminate the hologram, each nanoblock manipulates the phase of its corresponding color. The researchers explain that a key achievement of the study was to minimize the interactions between nanoblocks so that the nanoblocks function almost independently of each other. Then by orienting the nanoblocks in different ways, the researchers could change the light’s phase manipulation, resulting in different holographic images. “Our work provides an approach for realizing the almost independent manipulation of phase for different visible wavelengths in subwavelength resolution and in transmission mode due to the absence of interactions between nanoblocks within one meta-molecule, which allows for particular functionalities,” coauthor Yan Li, at Peking University, told Phys.org.The researchers demonstrated that the nanoblock approach can be used to create two different types of holograms. In an achromatic hologram, the entire reconstructed image is in one color. By balancing the relative input of the three colors, a wide spectrum of colors can be achieved. In the second type of hologram, called a highly dispersive hologram, different parts of the reconstructed image have different colors—for example, a red flower, green stem, and blue container. The new color hologram has a variety of potential applications where spectral wavefront manipulation is required, such as 3D color holograms, achromatic lenses, and anti-conterfeiting planar optical devices. The researchers plan to pursue these applications in future work.”Based on this idea and approach, novel real planar optical devices may be fabricated to realize many novel or extra functions in the future,” Weiguo Chu at the National Center for Nanoscience and Technology said. Journal information: Nano Letterslast_img read more