Journal
ACS NANO
Volume 5, Issue 4, Pages 2923-2929Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn200027x
Keywords
porphyrin; rectangular microtube; sharp bending waveguide; amplified spontaneous emission (ASE); lasing action; rectangular ring mode
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Funding
- MEST [2009-0083200, 2009-0065619, 2008-8-1807, 2007-KRF-000340, 2010-0002880]
- EPB center [2009-0063304]
- Priority Research Centers Program [2009-0094037]
- World Class University (WCU) program [R31-2008-000-10059-0]
- Creative Research Initiatives of MEST/KOSEF
- National Research Foundation of Korea [2010-0002880] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Lasing action by planar-, fiber-, or ring-type waveguide has been extensively investigated with different types of microcavities such as thin films, wires, cylindrical tubes, or ribbons. However, the lasing action by sharp bending waveguide, which promises efficient interconnection of amplified light in the photonic circuits, remains unexplored. Here, we report the first observation of microcavity effects In the organic rectangular microtubes (RMTs) with sharp bends (ca. 90 degrees) and subwavelength nanoscale wall thicknesses, based on single crystalline and themostable tetra(4-pyridyl)porphyrin (H(2)TPyP)-RMTs synthesized by the VCR process. A bright tip emission is observed from the sharp bending edges of a single RMT upon laser excitation, demonstrating a clear waveguiding behavior In RMT. The appearance of a peak from the (0-1) band at a threshold tube length and the gradual decrease of its full width at half-maximum (fwhm) suggest that amplification of spontaneous emission (ASE) is developed by stimulated emission along the walls of the RMTs. The ehancement of the ASE peak together with the narrowing of Its fhwm over a threshold pump power and the tube size (width and length) dependence of the mode spacing strongly support vibronic lasing action in the RMTs. The stimulated emission by the subwavelength bending waveguide demonstrates that the organic RMTs can be applied as new building blocks for micromanipulation of optical path and amplification in the integrated circuits for efficient photonic devices.
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