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          先进的“超普朗克“材料表现出为首状光当加热

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          March 23, 2020

          先进的“超普朗克“材料表现出为首状光当加热

          非常规材料发光的自然法则限制excede的

          莫不是一种新的光在宇宙?自19世纪后期,科学家们已经认识到,当加热时,所有材料在发射波长的预测的光谱的光。研究今天出版 科学性报告 呈现的材料会发光,似乎当加热到超出上限由自然法设置。

          In 1900, Max Planck first mathematically described a pattern of radiation and ushered in the quantum era with the assumption that energy can only exist in discrete values. Just as a fireplace poker glows red hot, increasing heat causes all materials to emit more intense radiation, with the peak of the emitted spectrum shifting to shorter wavelengths as heat rises. In keeping with Planck’s Law, nothing can emit more radiation than a hypothetical object that absorbs energy perfectly, a so-called “blackbody.”

          The new material discovered by Shawn Yu Lin, lead author and a professor of physics at Rensselaer Polytechnic Institute, defies the limits of Planck’s law, emitting a coherent light similar to that produced by lasers or LEDs, but without the costly structure needed to produce the stimulated emission of those technologies. In addition to the spectroscopy study just published in 科学性报告林此前公布的影像学研究中 IEEE光子学杂志。无论是在1.7微米关于,哪个是电磁波谱的近红外部分示出了辐射的尖峰。

          “These two papers offer the most convincing evidence of ‘super-Planckian’ radiation in the far-field,” said Lin. “This doesn’t violate Planck’s law. It’s a new way to generate thermal emission, a new underlying principle. This material, and the method that it represents, opens a new path to realize super-intense, tunable LED-like infrared emitters for thermophotovoltaics and efficient energy applications.”

          For his research, Lin built a three-dimensional tungsten photonic crystal — a material that can control the properties of a photon — with six offset layers, in a configuration similar to a diamond crystal, and topped with an optical cavity that further refines the light. The photonic crystal shrinks the spectrum of light that is emitted from the material to a span of about 1 micrometer. The cavity continues to squeeze the energy into a span of roughly 0.07 micrometers.

          lin've一直致力于建立17年ESTA进步,因为我创造了 在2002年第一个全金属光子晶体,而且两篇论文代表了最严格的测试,我已经进行。

          “实验,这是非常坚实的,并作为一个实验,我坚持我的数据。从理论角度看,还没有人有一个理论,充分说明我的发现,“林说。

          In both the imaging and spectroscopy study, Lin prepared his sample and a blackbody control — a coating of vertically aligned nanotubes on top of the material — side by side on a single piece of silicon substrate, eliminating the possibility of changes between testing the sample and control that could compromise the results. In an experimental vacuum chamber, the sample and control were heated to 600 degrees Kelvin, about 620 degrees Fahrenheit.

          In 科学性报告在五个位置截取林光谱分析礼物从填充有黑体的材料中的一个的视图红外光谱仪移至的孔径。发射峰,具有8倍大于黑体基准的强度,发生在1.7微米。

          The IEEE光子学杂志 用近红外常规电荷耦合器件拍摄纸张呈现的图像,照相机可以捕获该材料的预期的辐射发射。

          最近无关的研究已经显示出在低于2米的热的波长的来自样品的距离相同的效果,但林的是第一个材料显示超普朗克辐射在从30厘米距离测量的(关于200000个波长),示出了光的结果你已经完全从材料表面逃脱。

          Although theory does not fully explain the effect, Lin hypothesizes that the offsets between the layers of photonic crystal allow light to emerge from within the many spaces inside the crystal. The emitted light bounces back and forth within the confines of the crystal structure, which alters the property of the light as it travels to the surface to meet the optical cavity.

          “我们认为,光从内部晶体到来,但有这么多的计划内构造中,作为振荡器这么多的面,这么大的激励,那它的行为就像一个人工激光材料,”林说。 “这只是不是一个传统的表面。”

          The new material could be used in applications like energy harvesting, military infrared-based object tracking and identification, producing high efficiency optical sources in the infrared driven by waste heat or local heaters, research requiring environmental and atmospheric and chemical spectroscopy in the infrared, and in optical physics as a laser-like thermal emitter.

          “This exciting and unexpected discovery emphasizes the importance of conducting paradigm-shifting fundamental research that can move the boundaries of knowledge in physics and material science" said Curt Breneman, Dean of the Rensselaer School of Science. “We are very proud of Professor Lin and his team for leading the way towards the development of new and transformative technologies."

          “An In-situ and Direct Confirmation of Super-Planckian Thermal Radiation Emitted From a Metallic Photonic-Crystal at Optical Wavelength” was supported by NSF under award ECCS-1840673-NOA (device characterization and modeling) and DOE Office of Science under award DE-FG02-06ER46347 (device fabrication). At Rensselaer, Lin was joined by Mei-Li Hsieh, B. Frey, James A. Bur, Xuanjie Wang, and Shankar Narayanan, as well as Sajeev John of the University of Toronto, and Ting-Shan Luk of Sandia National Laboratory.

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          Reeve Hamilton
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          (518) 833-4277
          hamilr5@rpi.edu

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