Chattopadhyay, Rik and Haldar, Arindam and Paul, Mukul Chandra and Das, Shyamal and Bhadra, Shyamal Kumar (2015) Quantum sized Ag nanocluster assisted fluorescence enhancement in Tm3+-Yb3+ doped optical fiber beyond plasmonics. Applied Physics Letters, 107 (23). Article No-233107 . ISSN 0003-6951

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We report a process for enhancing fluorescence emission from conventional rare earth ions in optical fiber by metal nanocluster (MNC) in nonresonant indirect pumping. The process is completely different from formal metal enhanced fluorescence phenomenon as the MNCs are too small in size to support localized surface plasmon and the excitation wavelength is far from plasmon resonance frequency. We used an established theory of two coupled oscillators to explain the simultaneous enhancement of Ytterbium (Yb3+) and Thulium (Tm3+) emission by silver (Ag) NCs under nonresonant pumping in optical fiber. The fiber is pumped with a 980 nm fiber pigtailed laser diode with input power of 20-100 mW to excite the Yb3+. Four times enhancement of Yb3+ emission of 900-1100 nm and Tm3+ upconversion emission around 474 nm, 650 nm, and 790 nm is observed in the fiber with Ag NCs. (C) 2015 AIP Publishing LLC.

Item Type: Article
Subjects: Processing Science
Divisions: Fiber Optics and Photonics
Depositing User: Bidhan Chaudhuri
Date Deposited: 28 Jan 2016 09:30
Last Modified: 28 Jan 2016 09:30

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