Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 34, Issue 22, Pages 5250-5257Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2016.2607780
Keywords
Optical fiber devices; optical fiber lasers; optical materials; self-assembly
Funding
- National Research Foundation of Korea - Korea Government (MSIP), South Korea [NRF-2015R1A2A2A11000907, NRF-2015R1A2A2A04006979]
- National Research Foundation of Korea [2015R1A2A2A11000907, 22A20152213124, 2015R1A2A2A04006979] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The redshift of the long wavelength plasmonic absorption band is essential to the use of gold nanorods (GNRs) for the implementation of the infrared broadband saturable absorbers (SAs). A common method to obtain the GNR-based SAs with a substantially broad absorption bandwidth from 1 to 2 mu m is to use GNRs with a large aspect ratio. Here, a simple self-assembly technique is demonstrated, which enables us to obtain a significant redshift of the long wavelength plasmonic absorption peak of GNRs with a small aspect ratio, together with substantial spectral broadening of the absorption band. The proposed technique is based on an end-to-end self-assembly of the GNRs through hot air induced rapid drying of the GNRs in a deionized water solution, which makes the GNRs reassemble by attaching to one another by their ends. Using the proposed end-to-end self-assembly method for GNRs with an aspect ratio of 5.1, a single broadband SA that can operate from 1.5 to 1.9 mu m was fabricated on a fiber ferrule based sandwich platform. The saturable absorption performance was tested by incorporating the fabricated GNR-based SA into two different optical fiber based ring cavities: One was based on an erbium-doped fiber and the other was a thulium-holmium codoped fiber. Our fabricated single SA readily produced stable Q-switched pulses from both the cavities.
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