Journal
OPTICS EXPRESS
Volume 19, Issue 9, Pages 8903-8911Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.008903
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- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
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Broadband white light is of great spectroscopic value and would be a powerful tool for nanoscale spectroscopy, however, generation and direction of white light on this length scale remains challenging. Here, we demonstrate the generation of broadband white light in sub-wavelength diameter Gallium Nitride (GaN) wires by coincident one-and two-photon absorption mediated via defect states. This generation of broadband,. white. light enables single-nanowire interferometric measurements of the nanowires themselves via analysis of the Fabry-Perot fringes that overlay the entirety of the emission spectrum. The quality factor and finesse of individual nanowire cavities were measured and calculated to be 186 +/- 88 and 3.05 +/- 0.6 respectively, averaged over 20 individual wires. This work presents a new, simple approach for the generation and direction of broad band white light at sub-diffraction limit length scales, ideal for translating classical white light spectroscopies to higher spatial resolutions then previously achieved. (C) 2011 Optical Society of America
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