Near-field optical data storage using C-apertures

Leen, J. Brian; Hansen, Paul; Yao-Te Cheng; Gibby, Aaron; Hesselink, Lambertus
August 2010
Applied Physics Letters;8/16/2010, Vol. 97 Issue 7, p073111
Academic Journal
We demonstrate the all-optical recording of deeply subwavelength data bits in Ge2Sb2Te5 using a near-field scanning optical microscope (NSOM) probe that utilizes a C-aperture fabricated using through membrane focused ion beam milling. Data bits recorded with various optical powers were read out optically by C-aperture NSOM and the physical bit size was measured by atomic force microscopy (AFM). Both optical and AFM measurements were found to be in excellent agreement with simulation. We achieved a minimum physical bit size of 53.5×50.2 nm2 at a wavelength of 980 nm (λ/20) indicating a data density of 223 Gbit/in.2.


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