Time filter

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Park H.J.,University of Michigan | Xu T.,University of Michigan | Xu T.,CAS Chengdu Institute of Optics and Electronics | Lee J.Y.,University of Michigan | And 2 more authors.
ACS Nano | Year: 2011

Color filters are indispensable in most color display applications. In most cases, they are chemical pigment-based filters, which produce a particular color by absorbing its complementary color, and the absorbed energy is totally wasted. If the absorbed and wasted energy can be utilized, e.g., to generate electricity, innovative energy-efficient electronic media could be envisioned. Here we show photonic nanostructures incorporated with photovoltaics capable of producing desirable colors in the visible band and utilize the absorbed light to simultaneously generate electrical powers. In contrast to the traditional colorant-based filters, these devices offer great advantages for electro-optic applications. © 2011 American Chemical Society. Source

Jing H.,CAS Chengdu Institute of Optics and Electronics | King C.,University College London | Walker D.,University College London
Optics Express | Year: 2010

We present a novel method to accurately measure 3D polishing influence functions by using a swing arm profilometer (SAP) and a laser tracker. The laser tracker is used to align the SAP and measure the parameters of the SAP setup before measuring the influence function. The instruments and the measurement method are described, together with measurement uncertainty analysis. An influence function deliberately produced with asymmetric form in order to create a challenging test is measured, and compared with that of a commercial 3D profilometer. The SAP result is 48.2μm in PV, 7.271mm3 in volume. The 3D profilometer result is 48.4μm in PV, 7.289mm3 in volume. The forms of the two results show excellent correlation. This gives confidence of the viability of the SAP method for larger influence functions out of range of the commercial instrument. © 2010 Optical Society of America. Source

Luo X.G.,CAS Chengdu Institute of Optics and Electronics
Science China: Physics, Mechanics and Astronomy | Year: 2015

Metasurfaces are artificially structured thin films with unusual properties on demand. Different from metamaterials, the metasurfaces change the electromagnetic waves mainly by exploiting the boundary conditions, rather than the constitutive parameters in three dimensional (3D) spaces. Despite the intrinsic similarities in the operational principles of metasurfaces, there is not a universal theory available for the understanding and design of these devices. In this article, we propose the concept of metasurface waves (M-waves) and provide a general theory to describe the principles of such waves. Most importantly, it is shown that the M-waves share some fundamental properties such as extremely short wavelength, abrupt phase change and strong chromatic dispersion, which making them different from traditional bulk waves. We show that these properties can enable many important applications such as subwavelength imaging and lithography, planar optical devices, broadband anti-reflection, absorption and polarization conversion. Our results demonstrated unambiguously that traditional laws of diffraction, refraction, reflection and absorption can be overcome by using the novel properties of M-waves. The theory provided here may pave the way for the design of new electromagnetic devices and further improvement of metasurfaces. © 2015, Science China Press and Springer-Verlag Berlin Heidelberg. Source

Fu Y.,University of Electronic Science and Technology of China | Fu Y.,CAS Chengdu Institute of Optics and Electronics | Zhou X.,University of Electronic Science and Technology of China
Plasmonics | Year: 2010

Four types of plasmonic lenses for the purpose of superfocusing designed on the bases of approximate negative refractive index concept, subwavelength metallic structures, waveguide mode were introduced, and curved chains of nanoparticles, respectively, were introduced. Imaging mechanism, fabrication, and characterization issues were presented. Theoretical analyses of the illumination with different polarization states on focusing performance of the plasmonic lenses were given also. In addition, a hybrid Au-Ag plasmonic lens with chirped slits for the purpose of avoiding oxidation of Ag film was presented. © 2010 Springer Science+Business Media, LLC. Source

Kaplan A.F.,University of Michigan | Kaplan A.F.,CAS Chengdu Institute of Optics and Electronics | Xu T.,University of Michigan | Jay Guo L.,University of Michigan
Applied Physics Letters | Year: 2011

We propose a nanostructured color filter based on a metallic resonant waveguide structure capable of extremely high transmission efficiency. As an experimental demonstration, a blue and a red device were fabricated over a large area using nanoimprint lithography. Achieving transmission as high as 90 with a variable transmission bandwidth, these devices exhibit desirable features for numerous color filter applications. © 2011 American Institute of Physics. Source

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