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OnderzoekVan Swinderen Institute

Prof. dr. I.D.W. Samuel, Organic Semiconductor Centre, University of St. Andrews, Scotland: Organic Semiconductor Lasers and Optical Amplifiers

Roster

WhenWhere
11 November 2010 FWN-Building 5111.0080, Nijenborgh 4, 9747 AG, Groningen
Speaker: Prof. dr. Ifor Samuel
Affiliation: Organic Semiconductor Centre, University of St. Andrews, Scotland:
Title: Organic Semiconductor Lasers and Optical Amplifiers
Date: 11-11-2010
Start: 16.00
Location: FWN-Building 5111.0080
Host: Maria Loi

Abstract

The attractive properties of organic semiconductors such as simple fabrication and

scope for tuning properties make these materials appealing for a range of applications

in electronics and optoelectronics. The great progress made in materials for organic

light-emitting diodes has led to a newer field of organic semiconductor lasers. In

addition to simple processing and tuneability, the strong absorption, high gain cross

section, broad spectra and high solid state fluorescence quantum yields of organic

semiconductors are attractive for applications as lasers.

The development of practical polymer lasers requires progress in reducing the

threshold for lasing so that convenient pump sources can be made. Pump lasers have

been steadily reduced in size from large frame lasers to a microchip laser and more

recently a gallium nitride laser diode. The need for another pump laser has limited the

development of polymer lasers. We have overcome this problem by matching an

InGaN LED as pump source to a fluorene copolymer laser. The LED is a convenient

low cost electrical pump source and the polymer gives tuneable emission at

wavelengths not readily accessible by inorganic semiconductors. Hence this hybrid

optoelectronic device provides the key advantages of e ical pumping and simple

fabrication expected from an electrically pumped polymer laser. Recent results on the

use of polymer lasers for sensing explosive vapour wil lso be shown.

The presence of gain in organic semiconductors can also be used to make optical

amplifiers. These give broadband amplification of ultrafast optical pulses in the

visible region of the spectrum, and a pathway to all-optical switching.

Last modified:12 September 2014 11.21 a.m.