[China Instrument Network Instrument R&D] Recently, the research team of the Organic Nanophotonics Laboratory of the Bionics Intelligent Interface Science Center of the Institute of Physics and Chemistry, Chinese Academy of Sciences has made new advances in the field of optics and published a paper that draws attention.
Recently, the research team of the Organic Nanophotonics Laboratory of the Bionics Smart Interface Science Center of the Institute of Physics and Chemistry, Chinese Academy of Sciences published an article in the optical journal Laser and Photon Review [Laser & Photonics Review. 10(4), 665-672 (2016) , Three-dimensional Luneburg lens at optical frequencies. Zhao Yuanyuan, a doctoral student, is the author of the article, and associate researcher Zheng Meiling and researcher Duan Xuanming are co-authors.
The paper pioneered the use of nano-scale 3D printing technology - super-diffractive multiphoton direct writing processing technology to prepare a polymer three-dimensional Luneburg lens device, the size of which is only equivalent to 1/2 of the human hair diameter, the first time the true three-dimensional The working band of the Luneburg lens has been extended from the microwave to the light, making the study of the three-dimensional Luneburg lens a solid step from the macroscopic microwave field to the optical field. The research results will further promote the development of micro optics and transform optics, and open up a new application of nano-scale 3D printing technology in the field of micro-nano devices. The dissertation was selected as the Front Cover Article of Issue 10 of 2016, Laser & Photonics Review.
In recent years, the optical field has attracted worldwide attention for its series of new achievements, one of which is the rapid development of Gradient index optics. The object of gradient-index optical studies is the optical phenomena in non-homogeneous refractive-index media. Optical phenomena occurring in inhomogeneous media are a common objective physical phenomenon in nature. As early as AD 100, people had observed such miracles as “mirages in the mirage†and “desert gods in the desertâ€. They were all spectacle arising from the uneven refraction of the atmospheric refractive index on the landscape. By observing and studying these natural phenomena, people gradually realize that the non-uniformity of the refractive index of the material can lead to optical properties that some homogeneous media do not have. In 1944, RK Luneburg proposed a sphere-symmetrical spherical lens model with a gradient distribution of refractive index, n(r)=[2-(r/R)2]1/2, whose refractive index is from the center The position Ö2 gradually decreases to 1 in the radial direction, and the parallel rays incident on the Luneburg lens can be focused to a point on the spherical surface without aberration, so the Luneburg lens can achieve ideal aberration-free imaging or ideal focusing. However, due to the presence of aberrations, conventional spherical lenses cannot achieve the ideal focusing of light.
Although research results on Luneburg lenses with graded-index (GRIN) materials have been reported at home and abroad, there are still many problems to be solved. The Luneburg lens research and experiments based on micro-nano structured gradient index optics have been reported mainly in two-dimensional or quasi-three-dimensional (column symmetry) structures, and their application potential is far from being developed. Since the point source emits spherical waves, it is necessary to design, prepare, and study the true three-dimensional Luneburg lens of the optical band and to study its ideal imaging function in order to achieve true ideal imaging and truly utilize the wide field of view function of the Luneburg lens. However, the preparation technology of the GRIN optical Luneburg lens currently reported is mainly based on standard electron beam lithography and ion beam etching and other planar device processing technologies, and it is difficult to realize the preparation of a true three-dimensional gradient index device in the optical wavelength band.
Multiphoton laser direct writing processing technology is a low-cost, fast, high-precision 3D micro-nano structure preparation technology, which can break through the limit of the optical diffraction limit, the light reaction area is limited to the minimum three-dimensional space in the center of the spot focus ( ~l3), to achieve the processing of arbitrarily complex 3D micro-nano photonic structures. When the micro-nano photon structure size is much smaller than the wavelength, ie, in the metamaterial region, the photon structure can be considered as an equivalent medium with a certain refractive index. When adjusting the duty cycle or cycle length at different locations in the micro-nano structure, complex GRIN media can be obtained. In 2010, Wegner's research group achieved a quasi-three-dimensional stealth carpet structure with a wavelength range of 1.5-2.6mm by direct laser writing on the polymer structure; based on the inspiration of this work, the research team of Physico-Chemical Institute used femtosecond laser direct writing to design and process it. Based on a three-dimensional optical Luneburg lens with a gradient medium metamaterial, COMSOL simulation results show that its working band (>6mm) is located in the mid-infrared band. On this basis, relevant experimental verification work was carried out. The near-field optical microscope (SNOM) of Neaspec, Germany was used to characterize the focusing properties of a three-dimensional Luneburg lens under plane wave incidence. The measured intensity distribution of the light field showed a full width at half maximum ( The FWHM) is a l/2 spot morphology that verifies the Luneburg lens's ideal 3D focusing performance.
Based on multiphoton laser direct writing processing technology, the research team has achieved a series of research results in recent years, such as high-resolution 3D hydrogel structures (J. Mater. Chem. B 2, 4318-4323, 2014; 3, 8486-8491. , 2015), Chiral Complementary Metamaterials (Appl. Phys. Lett. 104, 011108, 2014), High-transmittance ordered metal grid transparent electrode structures (Appl. Phys. Lett. 108, 221104, 2016) , and was invited to write a review article in Chem. Soc. Rev. (Chem. Soc. Rev. 44, 5031-5039, 2015). The relevant research work has received strong support from the Ministry of Science and Technology's major research project on nano research ("973" project), the National Natural Science Foundation of China major research project, and the National Natural Science Fund project.
(Original title: Physico-chemical research progresses in Luneburg lens research in micro-scale lightwaves)
Recently, the research team of the Organic Nanophotonics Laboratory of the Bionics Smart Interface Science Center of the Institute of Physics and Chemistry, Chinese Academy of Sciences published an article in the optical journal Laser and Photon Review [Laser & Photonics Review. 10(4), 665-672 (2016) , Three-dimensional Luneburg lens at optical frequencies. Zhao Yuanyuan, a doctoral student, is the author of the article, and associate researcher Zheng Meiling and researcher Duan Xuanming are co-authors.
The paper pioneered the use of nano-scale 3D printing technology - super-diffractive multiphoton direct writing processing technology to prepare a polymer three-dimensional Luneburg lens device, the size of which is only equivalent to 1/2 of the human hair diameter, the first time the true three-dimensional The working band of the Luneburg lens has been extended from the microwave to the light, making the study of the three-dimensional Luneburg lens a solid step from the macroscopic microwave field to the optical field. The research results will further promote the development of micro optics and transform optics, and open up a new application of nano-scale 3D printing technology in the field of micro-nano devices. The dissertation was selected as the Front Cover Article of Issue 10 of 2016, Laser & Photonics Review.
In recent years, the optical field has attracted worldwide attention for its series of new achievements, one of which is the rapid development of Gradient index optics. The object of gradient-index optical studies is the optical phenomena in non-homogeneous refractive-index media. Optical phenomena occurring in inhomogeneous media are a common objective physical phenomenon in nature. As early as AD 100, people had observed such miracles as “mirages in the mirage†and “desert gods in the desertâ€. They were all spectacle arising from the uneven refraction of the atmospheric refractive index on the landscape. By observing and studying these natural phenomena, people gradually realize that the non-uniformity of the refractive index of the material can lead to optical properties that some homogeneous media do not have. In 1944, RK Luneburg proposed a sphere-symmetrical spherical lens model with a gradient distribution of refractive index, n(r)=[2-(r/R)2]1/2, whose refractive index is from the center The position Ö2 gradually decreases to 1 in the radial direction, and the parallel rays incident on the Luneburg lens can be focused to a point on the spherical surface without aberration, so the Luneburg lens can achieve ideal aberration-free imaging or ideal focusing. However, due to the presence of aberrations, conventional spherical lenses cannot achieve the ideal focusing of light.
Although research results on Luneburg lenses with graded-index (GRIN) materials have been reported at home and abroad, there are still many problems to be solved. The Luneburg lens research and experiments based on micro-nano structured gradient index optics have been reported mainly in two-dimensional or quasi-three-dimensional (column symmetry) structures, and their application potential is far from being developed. Since the point source emits spherical waves, it is necessary to design, prepare, and study the true three-dimensional Luneburg lens of the optical band and to study its ideal imaging function in order to achieve true ideal imaging and truly utilize the wide field of view function of the Luneburg lens. However, the preparation technology of the GRIN optical Luneburg lens currently reported is mainly based on standard electron beam lithography and ion beam etching and other planar device processing technologies, and it is difficult to realize the preparation of a true three-dimensional gradient index device in the optical wavelength band.
Multiphoton laser direct writing processing technology is a low-cost, fast, high-precision 3D micro-nano structure preparation technology, which can break through the limit of the optical diffraction limit, the light reaction area is limited to the minimum three-dimensional space in the center of the spot focus ( ~l3), to achieve the processing of arbitrarily complex 3D micro-nano photonic structures. When the micro-nano photon structure size is much smaller than the wavelength, ie, in the metamaterial region, the photon structure can be considered as an equivalent medium with a certain refractive index. When adjusting the duty cycle or cycle length at different locations in the micro-nano structure, complex GRIN media can be obtained. In 2010, Wegner's research group achieved a quasi-three-dimensional stealth carpet structure with a wavelength range of 1.5-2.6mm by direct laser writing on the polymer structure; based on the inspiration of this work, the research team of Physico-Chemical Institute used femtosecond laser direct writing to design and process it. Based on a three-dimensional optical Luneburg lens with a gradient medium metamaterial, COMSOL simulation results show that its working band (>6mm) is located in the mid-infrared band. On this basis, relevant experimental verification work was carried out. The near-field optical microscope (SNOM) of Neaspec, Germany was used to characterize the focusing properties of a three-dimensional Luneburg lens under plane wave incidence. The measured intensity distribution of the light field showed a full width at half maximum ( The FWHM) is a l/2 spot morphology that verifies the Luneburg lens's ideal 3D focusing performance.
Based on multiphoton laser direct writing processing technology, the research team has achieved a series of research results in recent years, such as high-resolution 3D hydrogel structures (J. Mater. Chem. B 2, 4318-4323, 2014; 3, 8486-8491. , 2015), Chiral Complementary Metamaterials (Appl. Phys. Lett. 104, 011108, 2014), High-transmittance ordered metal grid transparent electrode structures (Appl. Phys. Lett. 108, 221104, 2016) , and was invited to write a review article in Chem. Soc. Rev. (Chem. Soc. Rev. 44, 5031-5039, 2015). The relevant research work has received strong support from the Ministry of Science and Technology's major research project on nano research ("973" project), the National Natural Science Foundation of China major research project, and the National Natural Science Fund project.
(Original title: Physico-chemical research progresses in Luneburg lens research in micro-scale lightwaves)
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