Events Calendar
Sub-10-nm Three-Dimensional Plasmonic Probes and sensors
Thursday October 27, 2016
| 11:00 am
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Presenter: | Dr. Stefano Cabrini, Nanofabrication Facility Director, Molecular Foundry Lawrence Berkeley Natl. Laboratory |
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| Series: | OSE Seminars | |
| Abstract: | Plasmonic antennas have been investigated as potential sensing element since long, but great part of the efforts on the nanofabrication have been devoted to the 2 dimensional patterning. Many times the "sensing or probing" processes require geometries of the probe that are more complicated than the simple flat surface. In this seminar, I will show some example of three dimensional structures and their plasmonic properties as well as their application as sensors for IR spectroscopy and probes for Near-field scanning optical microscopy. I will present a series of structures and their characterization in IR as well as visible light. Particularly I will focus on the application of NSOM as a powerful and unique technique to characterize the chemical, physical and biochemical properties of materials with the nanometer scale resolution in real-time. One of the main challenges in using NSOM for a broad range of applications is the development of reproducible and efficient near-field probes. A novel class of nano-optical probes has been recently proposed, namely "campanile". Campanile tips consist of a 3-Dimensional (3D) tapered structure terminated by a plasmonic nano-antenna, which provides superior NSOM performance and decisive advantages. I will present a novel approach to drastically simplify the fabrication of Campanile probes by ultraviolet nanoimprint lithography (UV-NIL) directly on the facet of commercial optical fibers, without the need to use FIB. The 3D mold is fabricated by a combination of polymer embossing and FIB lithography in a Helium Ion Beam. I will show some characterization measurement, as well as some NSOM hyperspectral images. | |
| Location: | Room 103, Center for High Tech Materials | |
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