Abstract

Nonlocal communication between two laser light beams is experimented in a photochromic polymer thin films. Information exchange between the beams is mediated by the self-induction of a surface relief pattern. The exchanged information is related to the pitch and orientation of the grating. Both are determined by the incident beam. The process can be applied to experiment on a new kind of logic gates.

© 2005 Optical Society of America

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References

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Adv. Mater.

A. Natansohn, P. Rochon, ‘Photoinduced motions in Azobenzene-based amorphous polymers: Possible photonic devices,’ Adv. Mater. 11, 1387-1391 (1999).
[CrossRef]

C. Hubert, C. Fiorini-Debuisschert, I. Maurin, J.-M. Nunzi, P. Raimond, ‘Spontaneous patterning of hexagonal structures in an azo-polymer using light-controlled mass transport,’ Adv. Mater. 14, 729-32 (2002).
[CrossRef]

Appl. Opt.

Eur. Polymer J.

E. Ortyl, R. Janik, S. Kurcharski, ‘Methylacrylate polymers with photochromic side chains containing heterocyclic sulfonamide substituted azobenzene,’ Eur. Polymer J. 38, 1871-79 (2002).
[CrossRef]

Opt Lett.

S. Ahmadi Kandjani, R. Barille, S. Dabos-Seignon, J.-M. Nunzi, E. Ortyl, S. Kucharski, ‘Incoherent light-induced self-organization of molecules,’ Opt Lett. 30, 3177-9 (2005).
[CrossRef] [PubMed]

Opt. Lett.

Pure Appl. Chem.

C. Cojocariu, P. Rochon, ‘Tribute to Almeria Nathanson: Light-induced motions in azobenzene-containing polymer,’ Pure Appl. Chem. 76, 1479-1497 (2004).
[CrossRef]

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Figures (4)

Fig. 1.
Fig. 1.

Experimental set-up. Beam 1 is at normal incidence on the sample. Beam 2 is at a 32°-incidence angle. With respect to the incidence of beam 2, the polarization is TM for beam 1 and approximately TE for beam 2. BS: beam splitter; M1: mirror; λ/2: half wave plate.

Fig. 2.
Fig. 2.

Two dimensional Fourier transform of the two SRG spots (A) under the two signal beams without the incoherent pump. The same with the incoherent pump overlapping with the signal beams separated by a distance d = 920 μm (B), d = 650 μm (C) and d = 450 μm (D). The SRGs under beams 1 and 2 have a pitch Λ 1 = 880 nm and Λ 2 = 590 nm, respectively. The Fourier transform reflects the far field diffraction pattern of the SRG.

Fig. 3.
Fig. 3.

Power spectral density for different distances between the spots. PSD is measured for the vertical (blue lines) and horizontal (red lines) cross-sections of the SRG patterns under beam 1 (left) and 2 (right). Without coupling by the incoherent beam (A), coupled with 920 μm distance (B) and coupled with 650 μm distance (C). Inset in (A) shows the surface profile. Inset in (C) shows the AFM scan of a 20×20 μm2 region below the signal beams.

Fig. 4.
Fig. 4.

First order diffraction intensity as a function of time for the coherent beam 2. Beam 1 polarization is fixed at 45° and beam 2 polarization is vertical. The photodiode is set to measure the first order of diffraction from beam 2 in the horizontal direction. The signal detected is a signature of the polarization transfer from beam 1 to beam 2.

Tables (2)

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Table 1. Implementation of an OR logic gate with pitch Λi as test parameter.

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Table 2. implementation of an AND logic gate with polarization Pi as test parameter.

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