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Optical properties and enhancement factors of the tips for apertureless near-field optics
Journal of Optics. A, Pure and applied optics
Resonant excitation of surface plasmons of a metal or metal-coated tip is crucial for achieving high enhancement of an optical signal with apertureless near-field optics. However, it remains a challenge to measure the optical spectrum of a tip with sub-wavelength dimensions. We present a technique based on total internal reflection microscopy to measure the optical properties of tips. A dependence of the optical resonance on the metal deposited is shown for silver-coated and gold-coated tips.doi:10.1088/1464-4258/8/4/s19 fatcat:5zxdpbcoorcp3eibgvw2zxzyrq