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Focusing characteristics of optical fiber axicon microlens for near-field spectroscopy: Dependence of tip apex angle |
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| Authors: | Young-Jun Yu Heung-Ryoul Noh Wonho Jhe |
| Institution: | a School of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea b Department of Physics and Institute of Opto-Electronic Science and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea c Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan |
| Abstract: | We fabricated axicon microlenses on a single-mode bare optical fiber by using selective chemical etching technique. By varying the concentration and mixture ratios of etching solutions, we could make axicon microlenses with different apex angles (118°, 107° and 90°). We measured the illumination and collection efficiency of these microlenses by both objective-lens imaging and near-field photoluminescence (PL) spectroscopy of semiconductor quantum dots with respect to the distance between the sample and the axicon lens probe. We found that axicons with 118° and 107° 90°] apex angle tend to exhibit the laser focusing spot sizes of about 406 and 478 nm 382 nm] and maintain the high slightly low] collection PL intensity with the distance between the sample and the axicon probe. |
| Keywords: | 42 81 Bm 42 79 Bh 78 55 &minus m 78 67 Hc |
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