Use of electron trapping materials in optical signal processing 2: two-dimensional associative memory

Abstract

The application of electron trapping materials to new optical architectures of associative memory based on space- and Fourier-domain inner products is described. Experimental results are presented.

Effect of retrapping on photostimulated luminescence in Sr3SiO5:Eu2+, Dy3+ phosphor

“…[6][7][8][9] Up to the present, intense green and blue emitting persistent oxide phosphors have been commercially available with better chemical stability over sulfides. 1-6 Light energy can be stored in this kind material by exposing to radiation, x rays, ultraviolet ͑UV͒ or visible light, and subsequently released through thermal activation or photostimulation.…”

Dynamics of electron-trapping materials under blue light and near-infrared exposure: an improved model

“…Such a material possesses versatile optical properties, including high resolution and wavelength diversity, which make it attractive for a variety of technical applications [1,2]. ETM has been employed in the structure of computational machines such as parallel Boolean logic [3], spatial domain match filtering [4], associative memory [5][6][7], and adaptive learning [8], as well as optical data storage [1,2], infrared sensors, image intensifiers, and mediumwavelength infrared to visible converters [9,10].…”

Long lasting yellow phosphorescence and photostimulated luminescence in Sr3SiO5 : Eu2+and Sr3SiO5 : Eu2+, Dy3+phosphors

“…The phosphorescence process in Sr 3 SiO 5 : Eu 2+ is illustrated in figure 3. Considering the large energy gap of the Sr 3 SiO 5 host, the group of visible PLE bands and that of UV PLE bands are attributed to the transitions from the ground state 4f 7 to lower and higher 4f 6 5d 1 excited states of Eu 2+ (transitions 1 and 2) [11], respectively. In this case, the phosphorescence response spectrum means that light charging is performed through UV excitation from the ground state to the higher excited 4f 6 5d 1 states of Eu 2+ .…”

“…In addition, some rare earth ion activated long persistent phosphors are applicable for erasable optical storage. Light energy is stored in these materials by exposing it to x-rays, ultraviolet or visible light and is released through photostimulated luminescence (PSL) by infrared excitation [6][7][8][9]. That can realize stable and rewritable high-compact storage.…”