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Issue 29, 2018
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Enhancement of two-photon absorption photoresponse based on whispering gallery modes

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Abstract

Nonlinear multiphoton absorption technology is crucial for developing novel optoelectronic devices and nanophotonics. The large enhancement of two-photon absorption (TPA) photoresponse by a high Q-factor whispering gallery mode (WGM) resonance based on a single-microwire (MW) self-formed hexagonal cavity was investigated comprehensively in this paper. The typical quadratic relationship of photocurrent as a function of incident power indicated that excited carriers resulted from a third-order nonlinear mechanism. Moreover, the photocurrent response had a dramatic dependence on the spatial location of the focus spot of the incident photons. It was demonstrated that the TPA photocurrent response in the resonant WGM mode was one-order of magnitude larger than the response in the Fabry–Perot mode. Furthermore, the photoresponse characteristics of TPA detection exhibited sensitive dependence on the incident laser polarization direction.

Graphical abstract: Enhancement of two-photon absorption photoresponse based on whispering gallery modes

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Publication details

The article was received on 08 Apr 2018, accepted on 30 Jun 2018 and first published on 02 Jul 2018


Article type: Paper
DOI: 10.1039/C8NR02806K
Citation: Nanoscale, 2018,10, 14047-14054
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    Enhancement of two-photon absorption photoresponse based on whispering gallery modes

    Z. Chen, G. Lou, H. Zhu, A. Chen, Y. Wu, Y. Ren, J. Li, Z. Qiu, X. Gui and Z. Tang, Nanoscale, 2018, 10, 14047
    DOI: 10.1039/C8NR02806K

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