Flexible Plasmonic Color Filters Fabricated via Nanotransfer Printing with Nanoimprint-Based Planarization

Abstract

We investigated the preparation and performance of large-area transmission-type flexible plasmonic color filters (PCFs). These large-area PCFs were fabricated based on a nanotransfer printing (nTP) process that involves nanoimprint-based planarization. This process is a simple surface treatment for easy transfer of a metal to a flexible plastic substrate and formation of patterned aluminum nanodots and nanoholes on a substrate surface with poor roughness. Rabbit-ear structures can form during the nTP process, and this phenomenon was analyzed by numerical simulation. As defects were not detected in a 10 000-round bending test, the PCFs fabricated using this nTP process have excellent mechanical properties.

Adhesive-Layer-Free and Double-Faced Nanotransfer Lithography for a Flexible Large-Area MetaSurface Hologram

“…Figure a­(i) shows the fabricated flexible plasmonic color filter on a large area (photo of the flexed device is shown in the inset). Because of the EOT phenomenon, the geometric figures showed different colors determined by nanohole size and period. , Figure a­(ii,iii),b­(ii,iii) demonstrates the corresponding morphologies and cross-sectional images of one of the four kinds of hexagonal nanohole patterns with the results obtained for other patterns before and after transfer provided in Figure S8. The corresponding transmissions were provided in Figure S9.…”

“…The above approach allows one to easily change the colors of the signed hologram to elevate the density of nano/microstructures for nanodevices. The corresponding Si master comprised four kinds of hexagonal nanohole array color filters (based on the extraordinary transmittance (EOT) phenomenon , ) with different hole sizes and periods (Figure S7). The polymer stamp was prepared from the Si master following the procedure in Figure and was coated with Ag to a depth of 50 nm (Figure b).…”

Highly sensitive detection of low abundant molecules by pyro-electrohydro-dynamic jetting

“…Currently, most microfluidic systems consist of microchannels in which liquids are manipulated by applying pressure or voltage variations to the electrodes thus involving some disadvantages such as complex manufacturing, cross-contamination of the sample and the need to apply high voltages or pressures. In recent years, conventional approaches such as microcontact printing [7], photolithography [8], nanoimprint [9], and direct laser writing [10] have been overcome by inkjet printing, that exhibits numerous advantages in terms of flexibility, high precision and controllability of nanomaterials patterns in nanofabrication and nanodevices [11]. In particular, Electrohydrodinamic jet (E-jet) printing is widely used in important applications, such as biosensors [12], micro-nano optical devices [13], and flexible electronic devices [14].…”

Stretchable Structural Color Filters Based on a Metal–Insulator–Metal Structure

“…In the area of flexible electronics, a number of flexible color filters have recently been reported utilizing either thin‐film layer stacks or nanostructures . These flexible filters are generally fabricated on plastic substrates such as polyethylene terephthalate (PET) that are hundreds of micrometers in thickness, feature millimeter to centimeter‐scale bending radii, and demonstrate little change in transmittance after repeated mechanical bending.…”

“…These color filters feature a minimum bending radius of ≈5 µm, minimal change in transmission performance when repeatedly deformed, and only slight changes to transmitted color at increasing incident light angles. To the best of our knowledge, our color filters possess the smallest demonstrated bending radius for filters of both simple and complex geometries . Although in this case we used SiO 2 as the dielectric, in the case where higher‐refractive index dielectrics (TiO 2 , WO 3 , etc.)…”