Laser Writing in Polarized Silver Nanorod Films

Abstract

Polarized images have been prepared using simple laser‐induced melting of aligned nanorods in a polymer film. The technique is easy‐to‐use, cost‐effective, and may be used to render the read‐out either legible or illegible (see Figure). The information content could be increased by creating ordered nanoparticles with different angles of polarization, thereby permitting readout from different layers within the film, which might lead to 3D applications.

Dichroic nanocomposites based on polymers and metallic particles: from biology to materials science

“…51 Rod-like nanoparticles Similar to the above described nanocomposites with isotropic particles, rod-like silver nanoparticles (widths of the order of 10-40 nm, typical aspect ratios ≤5) were incorporated in poly(vinyl alcohol) after casting of polymer solutions with dispersed particles. 15,16,52 After drying, the resulting films were drawn at elevated temperature to draw ratios up to 5. 15,16 The rod-like particles oriented with the long axis preferentially parallel to the drawing direction, 15,16 and in one case it was shown by SEM that the particles formed uniaxially oriented assemblies (which also contained particles of other shapes such as spheres).…”

“…15,16,52 After drying, the resulting films were drawn at elevated temperature to draw ratios up to 5. 15,16 The rod-like particles oriented with the long axis preferentially parallel to the drawing direction, 15,16 and in one case it was shown by SEM that the particles formed uniaxially oriented assemblies (which also contained particles of other shapes such as spheres). 15 Notably, in highly viscous liquids subjected to shearing, orientation of gold nanorods (average aspect ratios 2.4-4.2) were oriented only as long as the shear forces were present; orientation was lost almost immediately when the shear rate was decreased to zero.…”

“…roughly spherical) [12][13][14]17,18,21 or rod-like nanoparticles. 6,15,16,19,20 The drawing process leads to orientation of the polymer molecules which can obviously induce concomitant formation of oriented particle assemblies or orientation of rod-like particles with the long axis parallel to the drawing direction. Shear forces acting during Walter Caseri graduated at ETH Zürich with a PhD in 1987.…”

A Photostimulated BaSi2O5:Eu2+,Nd3+ Phosphor‐in‐Glass for Erasable‐Rewritable Optical Storage Medium

“…[1,5] To address this issue, researchers fall back on the information multiplexing to increase the data size in the same volume via the expansion of optical storage dimension (e.g., wavelength, intensity, polarization, and lifetime, etc.). [6][7][8][9][10][11][12][13][14][15] When integrating multimode optical approaches into a single technique, based on an appropriate recording medium, the information capacity could be greatly improved by orders of magnitude. [5,13] Photostimulated luminescence (PSL) material, also called as electron trapping material, can store irradiation energy from X-ray, ultraviolet (UV), or visible light by capturing the created charge carriers in traps, and then release the stored energy upon low-energy light stimulation, thus theoretically can be used for data encoding/decoding.…”

Tailoring of Silver Nanoparticle Size Distributions in Hydrogenated Amorphous Diamond‐Like Carbon Nanocomposite Thin Films by Direct Femtosecond Laser Interference Patterning

“…[9] Depending on the energy densities applied, carbonaceous films are usually ablated, delaminated, or graphitized, [11] whereas the nanoparticles can melt, coalesce, or fragment. [20] To achieve a high patterning accuracy and prevent melting, lower laser repetition rates are preferred. [21] Also, shorter pulse durations (i.e., femtosecond pulses) are desirable for improved accuracy, reduction of the heated zone, and absence of plasma shielding.…”