Abstract
This paper introduces a compact optical information storage sensing system. Applications of this system include longitudinal surface plasmon resonance detection of gold nanorods with a single femtosecond laser in three-dimensional space as well as data storage. A diffractive optical element (DOE) is applied in the system to separate the recording-reading beam from the servo beam. This allows us to apply a single laser and one objective lens in a single optical path for the servo beam and the recording-reading beam. The optical system has a linear region of 8 λ, which is compatible with current DVD servo modules. The wavefront error of the optical system is below 0.03 λrms. The minimum grating period of the DOE is 13.4 μm, and the depth of the DOE is 1.2 μm, which makes fabrication of it possible. The DOE is also designed to conveniently control the layer-selection process, as there is a linear correlation between the displacement of the DOE and the layer-selection distance. The displacement of DOE is in the range of 0–6.045 mm when the thickness of the layer-selection is 0.3 mm. Experiments were performed and the results have been verified.
Highlights
An optical information sensor can be applied in many fields, such as optical storage and lightshows, as the quantities of the beam in the system can be detected, delivering macroscopic observation of the microscopic properties of a material [1]
Gold nanorods are one type of nanomaterial. They have the unique property of longitudinal surface plasmon resonance (LSPR) [2,3,4,5,6,7,8], which has a good sensitivity of wavelength and polarization
We have proposed a compact single laser opto-electronic system layout applied for a novel optical information storage sensing system by the use of a diffractive optical element
Summary
An optical information sensor can be applied in many fields, such as optical storage and lightshows, as the quantities of the beam in the system can be detected, delivering macroscopic observation of the microscopic properties of a material [1]. Exploiting the wavelength and polarization sensitivity of the LSPR effect of gold nanorods, Gu proposed true five-dimensional optical recording [9], including three spatial dimensions, wavelength, and polarization. In the following static experiment using DVD compatible apparatus [10], the potential of ultra-high density, three-dimensional optical memory of dual-layer recording in gold-nanorod-dispersed discs with an equivalent capacity of 69 GB was demonstrated. Upon the previous research work on gold-nanorod-dispersed discs, we propose a novel optical information sensor configuration which consists of a single-laser opto-electronic system applied to a specified multilayer disc structure. Some applications of the proposed system could be optical information sensing in micromachining, sensors, optical encryption and more as well as multi-dimensional optical data storage considering the LSPR effect of gold nanorods
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