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Acta Physica Sinica (Overseas Edition)

Anisotropic spectral holes in orangic PHB materials

Luo Xiao, Zhao Youyuan, Chen Ling-bin, Jianzhao Li, Wang Guo-yi, Fuming Li

Published Feb 1, 1994• 1 citation
Publisher

Abstract

More than 300% anisotropic persistent spectral holes were written in and read out in some materials such as THP/PMMA and TMP/PMMA with high signal-to-noise ratio by CW linearly polarized light. The effect of probe angle and modulation field on the hole depth and hole shape were also interpreted by using polarisation spectra hole burning theory.

DOI
10.1088/1004-423x/3/2/007

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More than 300% anisotropic persistent spectral holes were written in and read out in some materials such as THP/PMMA and TMP/PMMA with high signal-to-noise ratio by CW linearly polarized light. The effect of probe angle and modulation field on the hole depth and hole shape were also interpreted by using polarisation spectra hole burning theory.
Frequency-modulation polarization spectroscopy was used to detect persistent and anisotropic spectral holes written in the 607-nm color center in irradiated NaF and in the 683-nm absorption in phthalocyanine free-base-doped polyethylene. The high sensitivity of the technique permitted holes to be detected that had been written with exposure times down to 100 μsec. A general theory of frequency-modulation polarization spectroscopy is developed and specialized to the case of linear pump polarizations. Rate-equation models are presented to describe the anisotropic hole-burning process in a material, such as NaF, for which the absorbing centers have a finite distribution of possible orientations and in amorphous materials for which the distribution is uniform. The erasure of anisotropic holes because of excitation by the probe beam is investigated both theoretically and experimentally. A particular geometry was found to minimize this erasure effect in NaF.
Persistent spectral hole-burning (PHB) has been proposed as the essential element of a frequency domain optical storage system1 in which the frequency at which a hole is burned in an inhomogeneously broadened absorption line at low temperatures serves as an additional dimension for the storage of digital information. Essentially all of the mechanisms studied until recently have been single-photon mechanisms, i.e., the photoionduced change leading to hole-burning (writing) for a given center occurs with a certain fixed probability after the absorption of one photon. Such linear, monophotonic processes suffer from the drawback that the act of detecting holes (reading) can also produce changes in the absorption line. Recent modeling studies of the generalized single-photon process2 have shown that thousands to tens of thousands of reads can be obtained from single-photon mechanisms only when the material possesses high quantum efficiency and low absorption cross section. These restrictive requirements do not apply for photon-gated hole-burning mechanisms, i.e., those mechanisms for which hole-burning occurs only in the presence of an additional “gating” light source, because for these mechanisms, reading is performed in the absence of the gating light and is therefore nondestructive.
Persistent spectral hole-burning (PHB) is a photoinduced process in low temperature solids that may lead to a possible future application, frequency domain optical storage. The feasibility of such a data storage device depends critically upon having recording materials that undergo spectral hole-burning with certain well-defined characteristics. It is a stimulating challenge for the laser spectroscopist, photochemist, and physicist to find suitable materials and to devise detection techniques that make this application possible.
Persistent spectral hole-burning (PHB) is a phenomenon that allows an additional dimension, the frequency at which spectral holes are written, to be used to encode digital data. PHB can be used to store a large number of bits of information in the volume irradiated by a focused laser beam, leading to a possible future storage technology, frequency domain optical storage. A large number of photochemical and photophysical mechanisms have led to the production of spectral holes; a wealth of information has been learned about host-guest interactions, dephasing, and solid-state photochemistry at low temperatures. The general structure of a frequency domain optical store places a set of constraints on the engineering of such a system as well as on the materials used as recording media. The dynamics of the hole-burning process are crucial; for monophotonic mechanisms in particular, a set of stringent constraints can be derived that limit the applicability of this class of materials. Recent discoveries of two-color, photon-gated hole-burning offer special promise for nondestructive reading and improved performance.
We introduce a method of polarization spectroscopy into photon-gated persistent spectral hole burning, which results in considerable improvement in the signal-to-background ratio. Fifty multiple spectral holes burnt into meso-phenyl-tetrabenzoporphyrinato-zinc/aromatic cyanide/poly(methyl methacrylate) were clearly detected by this measurement technique. We developed a simplified model to account for the hole shapes. Background birefringence combined with refractive dispersion is thought to play a key role in the generation of asymmetric line shapes.