Home > Press > Scientists found a natural nanostructure to control the flow of light

An illustration of optical catenaries for the OAM generation. When a light beam incident on the catenary structures, orbital angular momenta are transferred from the structure to photons. This process is independent of the wavelength.



Credit: SKLOTNM, Chinese Academy of Science

Abstract:

Optical and photonic devices have become critical in current military and civil applications, such as laser weapons, remote sensing and infrared detection. Traditional optical devices are bulky and heavy because they rely on the phase accumulation on a long optical path. In an article published in Science Advances, a journal founded by the American Association for the Advancement of Science (AAAS), Prof. Xiangang Luo from the Chinese Academy of Sciences and the co-workers have now demonstrated that ultrathin and lightweight optical devices could be constructed using nanostructures catenaries, which were typically used in architectures to construct incredible buildings. Two of the famous catenaries are the arches under the roof of Gaudí’s Casa Milà, Barcelona, Spain and the Gateway Arch in St. Louis, Missouri, United States.

Scientists found a natural nanostructure to control the flow of light

Shuangliu, China | Posted on October 4th, 2015

The catenary is the curve that a free-hanging chain assumes under its own weight. It is a “true mathematical and mechanical form” in architecture described by Robert Hooke in the 1670s. The catenary could be found in many circumstances. For example, the silk on a spider's web form multiple elastic catenaries. The researchers now use optical catenary-shaped structures to convert circularly polarized light to helically-phased beam that carrying geometric linear phase profile. Similar to the “catenary of equal strength”, the phase gradient of the optical catenary is equal everywhere, which is a direct result of its special geometric shape. “The catenary structure could find applications in optics, architectures, and many other disciplines. This means that we could construct novel optical devices with strong similarity to the structures occurring in the natural world.” Prof. Luo explains.



Many previous methods used discrete nanostructures to generate space-variant phase distribution. The discrete structures lead to strong resonance, which makes the operating bandwidth of these samples limited. Prof. Luo’s group at the State Key Laboratory of Optical Technologies on Nano-fabrication and Micro-engineering (SKLOTNM), therefore uses the continuous catenary structures to obtain much broader bandwidth. They demonstrated that broadband orbital angular momentum (OAM) could be achieved by using the catenary array. The operating bandwidth of the devices could covers the entire electromagnetic spectrum ranging from microwave, terahertz, and infrared to the visible regime.



The catenaries could be used as a unique building block for optical metasurfaces, which are thought to be the key of the next-generation integrated optical systems. According to the metasurface-assisted law of reflection and refraction, many novel optical elements, such as flat lenses, axicons, and prisms, could be obtained with performance far beyond their traditional counterparts. Prof. Luo says, “The method of using catenary nanostructures to modulate phase works in many different circumstances. On the one hand, these nanostructures are natural candidates for the light manipulation on the nanoscale. On the other hand, when these structures are fabricated on flexible substrate, very lightweight and large-aperture lens could be realized. Such lenses make very large space telescopes become possible.”



Paper information:



M. Pu, X. Li, X. Ma, Y. Wang, Z. Zhao, C. Wang, C. Hu, P. Gao, C. Huang, H. Ren, X. Li, F. Qin, J. Yang, M. Gu, M. Hong, X. Luo, Catenary optics for achromatic generation of perfect optical angular momentum. Sci. Adv. 1, e1500396 (2015). DOI: 10.1126/sciadv.1500396

####

For more information, please click

Contacts:

Mingbo Pu





Copyright © Institute of Optics and Electronics, Chi

If you have a comment, please us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:



Related News Press

News and information

September 22nd, 2020

September 20th, 2020

September 18th, 2020

September 18th, 2020

Physics

September 11th, 2020

September 4th, 2020

August 14th, 2020

July 17th, 2020

Discoveries

September 22nd, 2020

September 20th, 2020

September 18th, 2020

September 18th, 2020

Announcements

September 22nd, 2020

September 20th, 2020

September 18th, 2020

September 18th, 2020

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

September 22nd, 2020

September 20th, 2020

September 18th, 2020

September 18th, 2020

Military

September 22nd, 2020

September 20th, 2020

September 18th, 2020

September 8th, 2020

Aerospace/Space

September 15th, 2020

August 25th, 2020

July 16th, 2020

July 3rd, 2020

Photonics/Optics/Lasers

September 18th, 2020

September 18th, 2020

September 11th, 2020

September 11th, 2020