8 September 2011 Nano-antenna based optical fiber probe
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Abstract
We propose a resonant optical Yagi-Uda nano-antenna fabricated at the end of the optical fiber probe for the sake of extracting the information of the angular directivity by absorption of directional emission as a subwavelength optical microscopy. A Yagi-Uda nano-antenna consists of a feed element surrounded by a reflector and three directors. The reflector and directors are optimized in pitches with regards to resonance of the antenna elements using the finiteelement method. We used a focused ion beam (FIB) to cut the end of the fiber probe tip away and make the flattened surface to mount the metal nano-antenna structure, followed by FIB platinum deposition patterning for the nano-antenna. To verify the characteristics of the probe based nano-antenna, directional emission from the metal slit with asymmetric metallic surface gratings is probed and detected using the photomultiplier tube. Our approach of the nano-antenna based fiber probe is suitable for scanning applications such as detection of directional emission.
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Jun-Bum Park, Jinsik Kim, Sookyoung Roh, Dawoon Choi, Hyun-Joon Shin, Byoungho Lee, "Nano-antenna based optical fiber probe", Proc. SPIE 8120, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications V, 81201I (8 September 2011); doi: 10.1117/12.894372; https://doi.org/10.1117/12.894372
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KEYWORDS
Metals

Reflectors

Absorption

Optical fibers

Nanolithography

Near field optics

Platinum

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