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Intrinsic optical gain in thin films of a conjugated polymer under picosecond excitation
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/content/aip/journal/apl/103/3/10.1063/1.4816040
2013-07-17
2014-12-27

Abstract

A strong excitation pulse width dependence on optical gain is reported in thin films of the conjugated polymer poly[2-methoxy-5-(2′-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV), which suggests that previously reported gain measurements have occurred in an excitation regime that cause damage to the polymer. Symmetric waveguides Si(100)/SiO/MEH-PPV/poly(methyl methacrylate) are fabricated and optically pumped using laser pulses having temporal widths shorter and longer than the PL decay time, resulting in transient and quasi-steady-state excitation conditions, respectively. Under quasi-steady-state conditions (8 ns pulses), a maximum gain coefficient of ∼135 cm is achieved at a fluence of 2250 J/cm. However, optical gain is observed under transient pumping (25 ps), reaching 700 cm at a fluence of only 85 J/cm; this 5× improvement in optical gain performance is achieved at the same excitation density as that for ns pulses. It is clear that our ps gain measurements more accurately represent the intrinsic net gain of MEH-PPV than prior measurements in the quasi-steady-state regime.

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Scitation: Intrinsic optical gain in thin films of a conjugated polymer under picosecond excitation
http://aip.metastore.ingenta.com/content/aip/journal/apl/103/3/10.1063/1.4816040
10.1063/1.4816040
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