Abstract
Tunable spectrum-response is desired for efficient photo-energy transformation. Blu-ray (~405 nm) and polarization sensitive Ag/TiO2 nanocomposite films are thus fascinating in application of fast-response and high-density optical memory device. The Ag/TiO2 film has the ability of replicating hologram based on optical coherence by laser-stimulated dissolution of Ag nanoparticles (NPs). The rate and efficiency of the dissolution are supposed to be enhanced by introducing uniform and small-sized Ag NPs in TiO2 nanoporous films. However, no effective methods have been proposed to resolve this issue by now. Here, we develop a simple method of thermal-reduction to obtain high-density, space-dispersed and extremely small-sized Ag NPs in TiO2 nanoporous films pretreated with tannic acid. The film shows both high and narrow absorbance band centered at ~405 nm. Diffraction efficiency of the blu-ray holographic storage in the Ag/TiO2 film is improved by one order of magnitude compared to the traditional UV-reduced sample. Based on such properties, polarization-multiplexing holograms are able to be written at 405 nm and readout with little crosstalk. This work provides effective solutions for sensitizing localized surface plasmon resonance at near-UV region, extending the growth range of Ag NPs in the volume of TiO2, and resultantly, realizing high-density optical memory.
Highlights
Tunable spectrum-response is desired for efficient photo-energy transformation
Based on a similar optical system to Blu-ray Disc (BD) storage, hologram with multiplexing technique can replace traditional information-bit via a series of coherent laser irradiations, which will promote the ability of large-volume optical storage beyond TB level[4,5,6,7]
The obtained storage medium contains the Ag NPs with the mean diameter of only 4 nm, and presents a narrow localized surface plasmon resonance (LSPR) absorption band centered at ~405 nm
Summary
Tunable spectrum-response is desired for efficient photo-energy transformation. Blu-ray (~405 nm) and polarization sensitive Ag/TiO2 nanocomposite films are fascinating in application of fast-response and high-density optical memory device. We develop a simple method of thermal-reduction to obtain high-density, space-dispersed and extremely small-sized Ag NPs in TiO2 nanoporous films pretreated with tannic acid. Diffraction efficiency of the blu-ray holographic storage in the Ag/TiO2 film is improved by one order of magnitude compared to the traditional UVreduced sample Based on such properties, polarization-multiplexing holograms are able to be written at 405 nm and readout with little crosstalk. It is feasible to tune LSPR to blue-violet region by fabricating small-sized NPs. Recently, (plasmonic-metal)/semiconductor hybrid nanostructures have received extensive attention for their variable optical response, resulting in the application in photocatalysis[14], surface-enhanced spectroscopy[15], sensor[16], solar cells[17] and information storage[18]. The original issue to obtain high-density and blu-ray sensitive Ag NPs in TiO2 nanoporous films has not been resolved yet
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