Direct imaging of optical cavity modes in ZnO rods using second harmonic generation microscopy

Brian P. Mehl; Ralph L. House; Abhineet Uppal; Amanda J. Reams; Chuan Zhang; Justin R. Kirschbrown; John M. Papanikolas

doi:10.1021/jp9009614

Direct imaging of optical cavity modes in ZnO rods using second harmonic generation microscopy

Brian P. Mehl, Ralph L. House, Abhineet Uppal, Amanda J. Reams, Chuan Zhang, Justin R. Kirschbrown, John M. Papanikolas

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

Images of second harmonie generation (SHG) in needle-shaped ZnO rods obtained from individual structures show areas of enhanced second harmonic intensity along the longitudinal axis of the rod that are periodically distributed and symmetrically situated relative to the rod midpoint. The spatial modulation is a direct consequence of the fundamental optical field coupling into standing wave resonator modes of the ZnO structure, leading to an enhanced backscattered second harmonic condition that cannot be achieved in bulk ZnO. A more complicated second harmonic image is observed when excitation is below the band gap, which is attributed to whispering gallery modes. This physical phenomenon, which extends beyond just ZnO to many other optical materials, could pave the way to new applications that exploit the nonlinear optical properties of individual structures.

Original language	English (US)
Pages (from-to)	1241-1246
Number of pages	6
Journal	Journal of Physical Chemistry A
Volume	114
Issue number	3
DOIs	https://doi.org/10.1021/jp9009614
State	Published - 2010
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry

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title = "Direct imaging of optical cavity modes in ZnO rods using second harmonic generation microscopy",

abstract = "Images of second harmonie generation (SHG) in needle-shaped ZnO rods obtained from individual structures show areas of enhanced second harmonic intensity along the longitudinal axis of the rod that are periodically distributed and symmetrically situated relative to the rod midpoint. The spatial modulation is a direct consequence of the fundamental optical field coupling into standing wave resonator modes of the ZnO structure, leading to an enhanced backscattered second harmonic condition that cannot be achieved in bulk ZnO. A more complicated second harmonic image is observed when excitation is below the band gap, which is attributed to whispering gallery modes. This physical phenomenon, which extends beyond just ZnO to many other optical materials, could pave the way to new applications that exploit the nonlinear optical properties of individual structures.",

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AU - Mehl, Brian P.

AU - House, Ralph L.

AU - Uppal, Abhineet

AU - Reams, Amanda J.

AU - Zhang, Chuan

AU - Kirschbrown, Justin R.

AU - Papanikolas, John M.

PY - 2010

Y1 - 2010

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AB - Images of second harmonie generation (SHG) in needle-shaped ZnO rods obtained from individual structures show areas of enhanced second harmonic intensity along the longitudinal axis of the rod that are periodically distributed and symmetrically situated relative to the rod midpoint. The spatial modulation is a direct consequence of the fundamental optical field coupling into standing wave resonator modes of the ZnO structure, leading to an enhanced backscattered second harmonic condition that cannot be achieved in bulk ZnO. A more complicated second harmonic image is observed when excitation is below the band gap, which is attributed to whispering gallery modes. This physical phenomenon, which extends beyond just ZnO to many other optical materials, could pave the way to new applications that exploit the nonlinear optical properties of individual structures.

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Direct imaging of optical cavity modes in ZnO rods using second harmonic generation microscopy

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