Model of holographic recording in amorphous chalcogenide films using subband-gap lightat room temperature

Holographic recording in amorphous As2S3 films at 633nm

“…There is one maximum around K = 1.4 lm in the case of focused beam recording but (as shown in [7]) there are two g max versus K dependence maxima (around K = 0.5 lm and around K = 10 lm) in the case of unfocused beam recording.…”

“…It is caused by the interference of multiply reflected light waves in a thin transparent film (e.g., transmittance of 72% at 633 nm corresponds to the measurements in Fig. 4) -Fabry-Perot resonator effect [7,11]. Nevertheless, one can draw some conclusions from Figs.…”

“…The SBLR intensity range of 10-100 W/cm 2 has not yet been studied. Besides, previous work (except our paper [7]) on sub-bandgap light holographic recording does not contain details such as DE time dependence, DE and recording energy grating period dependences, etc. Such details can be important to elucidate the underlying recording mechanism.…”

“…They have presented also the theoretical analysis based on D-center conversions. We have experimentally studied 633 nm holographic recording in thin a-As 2 S 3 films at low I = 0.04-0.23 W/cm 2 [7]. In this case the exposure time lasted up to 80 h, the hologram lifetime was only two days and the diffraction efficiency (DE, the ratio of the light power diffracted into the first order beam over the incident beam power) did not exceed 4.1%.…”

“…Photoinduced covalent bond breaking can be hardly expected for the sub-bandgap light. This situation changed since the middle of 1990s when different authors published the results [5][6][7][8][9] showing the possibility of efficient sub-bandgap recording. Hisakuni and Tanaka [5] have demonstrated a giant photoexpansion in As 2 S 3 glass by focused 6333 nm light with intensity I = 10 3 -10 4 W/cm 2 .…”