Selective photo-oxidation induced bi-periodic plasmonic structures for high-density data storage.

Area of Science:

• Materials Science
• Optics
• Nanotechnology

Background:

• Optical memory is crucial for information technology.
• Silver/titanium dioxide (Ag/TiO2) films offer photosensitivity for optical storage.
• Developing stable and controllable optical memory is an ongoing challenge.

Purpose of the Study:

• To investigate dual-wavelength holographic recording in Ag/TiO2 films.
• To compare simultaneous and sequential multiplexing methods.
• To achieve high-density optical storage with uniform contrast.

Main Methods:

• Dual-wavelength holographic recording using 403.4 nm and 532 nm lasers.
• Selective photodissolution of silver nanoparticles in TiO2 nanoporous films.
• Investigation of simultaneous and sequential multiplexing techniques.

Main Results:

• Mixed microfringes were obtained based on selective photodissolution of Ag nanoparticles.
• Simultaneous irradiation yielded equivalent efficiency in spectral hole burning and grating diffraction.
• Multiplexed-holographic fringes with uniform contrast were achieved using simultaneous recording.

Conclusions:

• Simultaneous recording in Ag/TiO2 films offers a superior method for uniform contrast multiplexed-holographic fringes.
• The Time-accumulation effect explains the observed ion diffusion and migration.
• This work presents a novel strategy for fabricating photonic devices with complex microstructures.