Recently, Associate Professor Zhang Luguo, a member of Micronanoptics and Technology Group led by Minghai and Wang Pei, Key Laboratory of Optoelectronics Science and Technology of China, Department of Optics and Optical Engineering, School of Optics and Optoelectronics, University of Science and Technology of China, and Professor JR Lakowicz, University of Maryland School of Medicine , Dr. Yuan Xiaocong, Dr. Lin Jiao, Dr. Du Luping and Dr. Kao Shan Shan from La Trobe University of Australia, Professor Yuan Xiaocong from Shenzhen University Nanophotonics Research Center, cooperated to produce a non-diffractive surface light wave in a liquid environment. The light wave can be about half wavelength above the sample (about 300 nm ), Transmitting 110 micrometers close to the surface while keeping the beam waist radius (about 2 micrometers) constant, ie without diffraction transmission, vividly portrays an elongated flat "In-Plane Virtual" Optical Probe). The research results, entitled "Diffraction-Free Bloch Surface Waves", were published online in the internationally renowned academic journal ACS Nano on May 15th. My school PhD students Wang Ru snow and Wang Yong as co-author, Zhang Douguo for the correspondence.
As we all know, diffraction is the basic characteristics of electromagnetic waves (including light waves), the wave propagation process, the horizontal size will be larger and larger, resulting in wave energy divergence in the entire space, is not conducive to signal transmission and coupling. In recent years, with the rapid development of micro-nano processing technology and Plasmonics, two-dimensional non-diffractive surface beams such as Plasmonic Airy Beam and Cosine-Gauss Plasmon Beam have been successively realized. However, this kind of surface light wave based on Plasmonic effect of metal structure has the problem of large loss and short propagation distance, especially in the visible light band and liquid environment, thus limiting its application. Up to now, there is no report on the non-diffraction surface beam in the rare liquid, and the liquid environment is one of the indispensable conditions for the applications of micro-nano manipulation, imaging and sensing in biological photonics aimed at no-diffractive beam.
Based on this, the research team proposed and implemented a Diffraction-Free Bloch Surface Waves based on a pure dielectric structure consisting of a periodic multilayer dielectric film, as shown in the following figure. The light beam can exist at a liquid or air interface. The intrinsic loss of dielectric material is much smaller than the metal, so its transmission loss is small. Medium structure The surface of the material for the conventional glass, the glass substrate to do the relevant biological, chemical modification is far easier in the metal substrate, and thus the application prospects will be more extensive. Experimental results show that the obstacle in the propagation path will not destroy the non-diffraction transmission characteristics of the surface light wave, that is, it has self-repairing function. In view of the above characteristics, this non-diffraction surface wave will have practical application prospect in the field of surface chemistry, surface physics, integrated on-chip photonic devices and optical micro-nano-control, imaging and sensing.
This work has been supported by funding from the Ministry of Science and Technology, the National Natural Science Foundation of China, and Outstanding Youth Fund of Anhui Province. Related sample production process has been the University of Science and Technology of China Micro and nano research and manufacturing center of equipment and technical support.
Non-diffractive Bloch surface wave through the three obstacles, continue to maintain non-diffraction transmission characteristics: different transmission distance at the same beam waist radius.
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