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      "body": "<html> <p>https://cdn.steemitimages.com/DQmQJXfk4tPh3sbiEgfa1Y4WvdyCwn8HJr9Z6KzaFahZ4H5/image.png</p> <p><br></p> <p>Researchers is taking solar sailing to the next level with advanced photonic materials. This new class of materials could be used to steer reflected or transmitted photons and enable near-Earth, interplanetary and interstellar space travel.</p> <p>Spacecraft outfitted with sails and propelled by the sun are no longer the stuff of science fiction or theoretical space missions. Now, a Rochester Institute of Technology researcher is taking solar sailing to the next level with advanced photonic materials.</p> <p><br></p> <p><strong>Metamaterials</strong> -- a new class of humanmade structures with unconventional properties -- could represent the next technological leap forward for solar sails, according to Grover Swartzlander, professor in RIT's Chester F. Carlson Center for Imaging Science. He proposes replacing reflective metallic sails with diffractive metafilm sails. The new materials could be used to steer reflected or transmitted photons for near-Earth, interplanetary and interstellar space travel.</p> <p>'Diffractive films may also be designed to replace heavy and failure-prone mechanical systems with lighter electro-optic controls having no moving parts,' he said.</p> <p>Swartzlander is leading an exploratory study supported by phase one funding from NASA's Innovative Advanced Concepts program. The nine-month, $125,000 award encourages development of visionary technology with potential to revolutionize future space exploration. The Optical Society is hosting an incubator meeting, Metamaterial Films for In-Space Propulsion by Radiation Pressure, Oct. 7-9 in Washington, D.C., to create a roadmap for advancing metamaterial sails on low Earth-orbiting satellites called CubeSats. Swartzlander will facilitate the meeting with co-organizers Les Johnson, manager of the In-Space Propulsion Technology Projects Office at NASA Marshall Space Flight and principal investigator of NASA Near-Earth Asteroid Scout mission, or NEA Scout; and Nelson Tabirian, president of BEAM Co., which specializes in optical technologies and materials.</p> <p>'CubeSats are becoming of great national importance for science, security and commercial purposes,' Swartzlander said. 'The potential to raise, de-orbit or station-keep hundreds of CubeSats from low Earth orbit would be a recognized game changer that would build enthusiasm and advocacy among the growing small-satellite community of students, entrepreneurs and aerospace scientists and engineers.'</p> <p>NEA Scout will be the first CubeSat science mission having attached sails. It is one of 13 satellites that will conduct science and technology investigations as part of NASA's Exploration Mission-1. EM-1 is slated to launch this year on the new Space Launch System rocket. When deployed, NEA Scout's aluminum coated polyimide sail will reflect sunlight to propel the reconnaissance robotic spacecraft on its two-year cruise.</p> <p>Swartzlander said diffractive metafilm sails could correct known limitations of reflective metallic sails -- overheating, inefficient use of photons and excessive tilt of the spacecraft -- because the new materials can:</p> <blockquote>Lower absorption: The proposed diffractive surfaces would eliminate problems inherent in the metallic-coatings, which heat and compromise sail substrates;</blockquote> <blockquote>Reuse of photons: Diffractive sails would recycle transmitted photons, converting them to solar-electric power or diffracting the light twice for added momentum. (Reflective sails reflect photons back into space or absorb in the metallic coating); and</blockquote> <blockquote>Improved orientation: Diffractive sails maintains a more efficient position facing the sun, allowing highly efficient propulsion and generation of solar electric power on embedded photovoltaic cells. (Reflective sails work best when the spacecraft is tilted. However, this orientation decreases the projection of solar power upon the sail.)</blockquote> <p>'Diffractive sails may also be designed for laser-based propulsion, a decades-old concept that has recently attracted significant interest from private investors, resulting in a program called Breakthrough Starshot,' Swartzlander said.</p>https://cdn.steemitimages.com/DQmeoHJYuAdpx39Axv4tT9kXHNYtfVBEPEfYgbPUa2mWA2j/image.png</html>",
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      "body": "<html>https://cdn.steemitimages.com/DQmRkXFomkS8aYs6ncE8fAc42tAbuWAqcjztLTuXspg4bcJ/image.png <p><strong>The nucleus of thorium-229 possesses a property that is unique among all known nuclides: It should be possible to excite it with ultraviolet light. To date, little has been known about the low-energy state of the Th-229 nucleus that is responsible for this property. Together with their colleagues from Munich and Mainz, researchers at the Physikalisch-Technische Bundesanstalt (PTB) have now performed the first-ever measurements -- using optical methods -- of some important properties of this nuclear state such as the shape of its charge distribution. In this way, a laser excitation of the atomic nucleus can be monitored, thus allowing an optical nuclear clock to be realized that 'ticks' more precisely than present-day atomic clocks. The scientists have reported their results in the current issue of Nature.</strong></p> <p><br></p> <p>As early as around <strong>15 years ago</strong>, Ekkehard Peik and Christian Tamm were developing the concept of a new atomic clock that had unique properties at PTB in Braunschweig: Instead of a transition frequency between two states in the electron shell being used as the pulse generator of their clock, as is the case in all atomic clocks in use today, they envisaged using a transition frequency in the nucleus. Because the protons and neutrons in the nucleus are packed more densely than the electrons in the atomic shell by several orders of magnitude, they react less sensitively to outside disturbances that can change their transition frequencies -- thus providing good conditions for a high-precision clock.</p> <p><br></p> <p>However, the frequencies of nuclear transitions are also much higher than those of shell transitions (in the X-ray range); for this reason, they are unusable for atomic clocks, which, to date, have been based exclusively on microwaves or laser light. The sole known exception, and the foundation of PTB's proposal, is the nucleus of thorium-229. This nucleus possesses a quasi-stable, isomeric nuclear state at exceptionally low excitation energy. Thus, a transition exists between the ground state and this isomer, which is in the frequency range of ultraviolet light, and thus within the reach of laser technology that is similar to that used in present-day optical atomic clocks.</p> <p><br></p> <p>More than ten research groups around the world are currently working on projects concerning the feasibility of a thorium-229 nuclear clock. In experimental terms, this issue has proven to be extremely difficult. For this reason, no success has been achieved thus far in observing the nuclear transition using optical methods, as knowledge of the precise excitation energy of the isomer has been only approximate. 'As desired for the clock, the resonance of the transition is extremely sharp and can only be observed if the frequency of the laser light precisely matches the energy difference of both states. The problem therefore resembles the proverbial search for a needle in a haystack,' as Dr. Peik succinctly puts it.</p> <p><br></p> <p>In 2016, Dr. Peik's cooperation partners at Ludwig-Maximilians-Universität (LMU) in Munich reported on their first breakthrough in Nature: For the first time, they were able to prove the nuclear transition within the thorium-229 nucleus, even though the methods they used were very different from those used for an atomic clock.</p> <p><br></p>https://cdn.steemitimages.com/DQmSWaRPSKGDkQQL1kZV7AbkpV7BFaHSTE3EGjUtEDGQHNP/image.png <p>This collaborative research project -- which, in addition to PTB and LMU scientists, also includes scientists from Johannes Gutenberg University Mainz, the Helmholtz Institute Mainz and GSI Helmholtzzentrum für Schwerionenforschung Darmstadt -- has now taken another decisive step: For the first time, it has been possible for basic properties such as the size and shape of the charge distribution to be measured in the excited state of the Th-229 nucleus. To this end, the Th-229 nuclei were not excited from their ground state (as will happen in the future in the clock); instead, in a device developed by LMU, they were obtained in the excited state from the alpha decay of uranium-233, slowed and stored as Th2+ ions in an ion trap. A uranium-233 source suitable for this purpose was provided by the groups in Mainz and Darmstadt. By means of laser systems developed at PTB for the spectroscopy of these ions, it was possible to measure transition frequencies in the electron shell accurately. Because these frequencies are directly influenced by the nuclear properties, they can be used to obtain information on these properties. To date, models based solely on theory have not been able to predict how the structure of the Th-229 nucleus will behave during this unusually low-energy transition. Furthermore, because the structure of the electron shell is easier to measure using spectroscopy, it has become possible to use it to demonstrate a laser excitation of the nucleus.</p> <p><br></p> <p>However, even if this does not mean that the search has been completed for the optical resonant frequency of the Th-229 nucleus (the 'needle in the haystack'), we now know what the needle actually looks like, bringing us a significant step closer to the optical atomic clock. (es/ptb)</p> </html>",
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