Microholographic Optical Data Storage with Spatial Mode Multiplexing

Abstract

We use the improved Faddeev-Jackiw quantization method to quantize the electromagnetic field and its Lagrange multiplier fields. The method's comparison with the usual Faddeev-Jackiw method and the Dirac method is given. We show that this method is equivalent to the Dirac method and also retains all the merits of the usual Faddeev-Jackiw method. Moreover, it is simpler than the usual one if one needs to obtain new secondary constraints. Therefore, the improved Faddeev-Jackiw method is essential. Meanwhile, we find the new meaning of the Lagrange multipliers and explain the Faddeev-Jackiw generalized brackets concerning the Lagrange multipliers.

Recent advances in holographic data storage

“…In this technique, multilevel phase signals are stored as the fringe shifts along the optical axis and recovered from the arctangent of two homodyne-detected signals [47]. They also proposed a new novel multiplexing technique using spatial modes of an optical beam to enhance data capacity [48]. Numerical simulation was performed to validate the proposal and it was estimated that the net increase of data capacity by applying two-and four-mode multiplexing with Hermite-Gaussian modes was 1.3 and 1.7 times, respectively [48].…”

“…Numerical simulation was performed to validate the proposal and it was estimated that the net increase of data capacity by applying two-and four-mode multiplexing with Hermite-Gaussian modes was 1.3 and 1.7 times, respectively [48]. A proof-of-principle experiment for twomode multiplexing was performed by using spatial modes equivalent to Laguerre-Gaussian modes and it was demonstrated that signal output was selectively obtained by choosing an appropriate spatial mode for reference light of phase-diversity homodyne detection [48]. Recently, Katayama proposed a novel angular momentum technology [49].…”

Aberration multiplexing in microholographic recording

“…20) Other recent research topics in microholographic recording include threshold recording materials, 21,22) sub-diffraction-limited recording, 23,24) phase multilevel recording, 25,26) and spatial mode multiplexing. 27) Among them, multiplexing technologies are most important for further improving the recording capacity by combining them with three-dimensional recording technology. However, in wavelength and angle multiplexing, the wavelength and angle selectivity decrease when the numerical aperture of the objective lenses increases.…”