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Plasmonic Janus Microspheres Created from Pickering Emulsion Drops
摘要： Metal nanostructures have been created in a film format to develop unique plasmonic properties. Here, well-defined metal nanostructures are designed on the surface of microspheres to provide plasmonic microgranules. As conventional techniques are inadequate for nanofabrication on spherical surfaces, photocurable emulsion drops with a regular array of silica particles are employed at the interface to create periodic nanostructures. The silica particles, originating from the dispersed phase, fully cover the interface by forming a non-close-packed hexagonal array after drop generation, and slowly protrude to the continuous phase during aging while their interparticle separation decreases. Therefore, hexagonal arrays of spherical dimples with controlled geometry and separation are created on the surface of microspheres by photocuring the drops and removing the particles. Directional deposition of either aluminum or gold results in a continuous film with a hexagonal array of holes on the outermost surface and isolated curved disks in dimples, which renders the hemisphere of microspheres plasmonically colored. The resonant wavelength is controlled by adjusting the aging time, metal thickness, and size of silica particles, providing various plasmonic colors. This granular format of the plasmonic Janus microspheres will open a new avenue of optical applications including active color pixels, optical barcodes, and microsensors.
关键词： Janus microspheres,self-assembly,colloids,Pickering emulsions,plasmonic colors
更新于2025-09-23 15:21:01
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Electrochemical Switching of Plasmonic Colors Based on Polyaniline-Coated Plasmonic Nanocrystals
摘要： Plasmonic color generation has attracted much research interest due to the unique optical properties of plasmonic nanocrystals that are promising for chromatic applications, such as flat-panel displays, smart windows and wearable devices. Low-cost, monodisperse plasmonic nanocrystals supporting strong localized surface plasmon resonances are favorable for the generation of plasmonic colors. However, many implementations so far have either a single static state or complexities in the particle alignment and switching mechanism for generating multiple displaying states. Herein we report on a facile and robust approach for realizing the electrochemical switching of plasmonic colors out of colloidal plasmonic nanocrystals. The metal nanocrystals are coated with a layer of polyaniline, whose refractive index and optical absorption are reversibly switched through the variation of an applied electrochemical potential. The change in the refractive index and optical absorption results in the modulation of the plasmonic scattering intensity with a depth of 11 dB. The electrochemical switching process is fast (~5 ms) and stable (over 1000 switching cycles). A device configuration is further demonstrated for switching plasmonic color patterns in a transparent electrochemical device, which is made from indium-tin-oxide electrodes and a polyvinyl alcohol solid electrolyte. Our control of plasmonic colors provides a favorable platform for engineering low-cost and high-performance miniaturized optical devices.
关键词： polyaniline,electrochemical switching,plasmonic color display,noble metal nanocrystals,plasmonic colors,plasmon resonance
更新于2025-09-23 15:19:57
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Plasmonic Color Laser Printing inside Transparent Gold Nanodisk‐Embedded Poly(dimethylsiloxane) Matrices
摘要： Plasmonic color generation from metal nanostructures has attracted intensive attention because of their excellence in achieving high spatial resolution, strong color contrast, and long-term durability. The limited area of plasmonic patterns anchored on substrates and produced by current top-down methods, however, severely restricts the advanced developments and potential applications in structural color display. Herein a robust method for realizing the laser printing of plasmonic colors inside transparent gold nanodisk-embedded poly(dimethylsiloxane) matrices is presented. It is found that various colors can not only be easily generated by embedding gold nanodisks of different sizes, but also finely varied by adjusting the laser pulse intensity during printing. It is further demonstrated that multiple color layers can be laser-printed at different depths. Stereoscopic images in the 3D matrices are laser-printed with sizes as large as 12 × 15 mm2 and a resolution of 4600 dots per inch.
关键词： laser color printing,plasmonic colors,poly(dimethylsiloxane),gold nanodisks,plasmons
更新于2025-09-16 10:30:52
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Electrically tunable multicolored filter using birefringent plasmonic resonators and liquid crystals
摘要： Dynamic tuning of color filters finds numerous applications including displays or image sensors. Plasmonic resonators are sub–wavelength nanostructures which can tailor the phase, polarization and amplitude of the optical field but they are limited in color vibrancy when used as filters. In this work, birefringence–induced colors of plasmonic resonators and a fast switching thin liquid crystal cell are combined in a multicolored electrically tunable filter. With this mechanism, the color gamut of the plasmonic surface and the liquid crystal cell is mutually enhanced in order to generate all primary additive and subtractive colors with high saturation as well as different tones of white. A single filter is able to cover more than 70% of the color gamut of standard RGB filters by applying a voltage ranging between 2V and 6.5V. This spectral selectivity is added in transmission without any loss in the image resolution. The presented approach is foreseen to be implemented in a variety of devices including miniature sensors or smart-phone cameras to enhance the color information, ultra–flat multispectral imagers, wearable or head–worn displays as well as high resolution display panels.
关键词： liquid crystals,color display,nanoimprint lithography,multispectral imaging,Plasmonic colors,tunable filters
更新于2025-09-12 10:27:22