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Mechanically tunable conjugated polymer distributed feedback lasers
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Image of FIG. 1.

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FIG. 1.

(a) Fabrication process. (1) PSS and F8BT are sequentially spin-coated on a flat substrate, then the corrugation is imprinted by hot embossing from an ETFE master (2,3). After deposition of PDMS (4) and curing, the substrate is removed by dissolving the PSS layer and the polymer stack is finally completely embedded in PDMS (5) resulting in a stretchable device (6). (b) AFM image of the corrugated F8BT. The periodicity is 353 nm and the groove depth .

Image of FIG. 2.

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FIG. 2.

Emission characteristics of an F8BT flexible device pumped at 480 nm (pulse duration: 150 fs). (a) Example of spectra measured under variable applied strain. (b) Emission spectra obtained with pump pulse energy slightly above and below lasing threshold . (c) Typical emission spectrum above lasing threshold showing FWHM of 1.1 nm.

Image of FIG. 3.

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FIG. 3.

Emission intensity at the lasing frequency as a function of the pump pulse energy and fluence. Threshold: (5.3 nJ).

Image of FIG. 4.

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FIG. 4.

(a) Experimental (squares) and theoretical (circles) lasing wavelength vs applied strain. FDTD calculations are for a 130 nm F8BT film with a corrugation of periodicity . The dashed and the dotted lines represent the FDTD simulation using the effective strain obtained using an analytical fit of the experimental data for and , respectively. (b) Contour plot showing the position and intensity (a.u.) of the ASE of F8BT vs angle. The upper and lower lines represent the 2nd and 3rd bands, respectively, of a 1D sinusoidal photonic crystal made of F8BT and PDMS and a lattice parameter of .

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/content/aip/journal/apl/97/19/10.1063/1.3509405
2010-11-08
2014-04-16

Abstract

Herein we report a low-threshold organic laser device based on semiconducting poly(-dioctylfluoren-2,7-diyl-alt-benzothiadiazole) (F8BT) encapsulated in a mechanically stretchable polydimethylsiloxane(PDMS) matrix. We take advantage of the natural flexibility of PDMS to alter the periodicity of the distributed feedback grating which in turn tunes the gain wavelength at which the resonant feedback is obtained. This way, we demonstrate that low-threshold lasing [ (5.3 nJ)] is maintained over a large stretching range of 0%–7% which translates into a tuning range of about 20 nm.

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Scitation: Mechanically tunable conjugated polymer distributed feedback lasers
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/19/10.1063/1.3509405
10.1063/1.3509405
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