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All-optical switching in the near infrared with bacteriorhodopsin-coated microcavities
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10.1063/1.2372711
/content/aip/journal/apl/89/18/10.1063/1.2372711
http://aip.metastore.ingenta.com/content/aip/journal/apl/89/18/10.1063/1.2372711
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Figures

Image of FIG. 1.
FIG. 1.

(Color) (a) Schematic of three oriented PDAC/bR layers adsorbed by alternate electrostatic deposition onto the surface of silica microsphere. Cytoplasmic surface of bR is at the bottom and extracellular at the top of the lipid bilayer. Seven transmembrane -helices (green) surround the optically active chromophore retinal (red). (b) Schematic representation of an all-optical switch operation. A silica microsphere with adsorbed three layers of D96N is positioned between two optical fibers forming a tunable four-port resonant coupler. A green pump laser , connected to input port 1, controls the conformation state of the retinal. When the pump is off (all-trans isomer) the near-IR probe is transmitted from input port 1 to output port 2 as indicated with the straight arrow. Turning the pump on (13-cis isomer) reroutes the probe into output port 3 (red arrow).

Image of FIG. 2.
FIG. 2.

(Color) (a) (A) Top-view photomicrograph of a bR-coated microsphere positioned between two tapered fibers. The image was obtained at ambient illumination with a CCD camera. (B) The same microsphere with whispering-gallery resonances excited with a green pump beam from port 1. (C) IR image of probe beam propagation with the pump turned off and (D) IR-probe propagation with the pump on. The corresponding conformation states of the retinal are shown above the photomicrographs. (b) Resonant transmission spectra of a microsphere measured in ports 2 (left) and 3 (right) by scanning the probe laser around . With the pump off (black line) port 2 shows a high transmission and port 3 a low transmission at . The reverse is true when the pump is on (gray line).

Image of FIG. 3.
FIG. 3.

(a) Switching kinetics for periodic pump modulation measured in ports 2 and 3. The time-resolved transmitted intensity of the probe reflects a fast photoinduced transition of bR from the ground (all-trans) to the state (13-cis) followed by a slow thermal recovery of the ground state.

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/content/aip/journal/apl/89/18/10.1063/1.2372711
2006-10-31
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: All-optical switching in the near infrared with bacteriorhodopsin-coated microcavities
http://aip.metastore.ingenta.com/content/aip/journal/apl/89/18/10.1063/1.2372711
10.1063/1.2372711
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