Nanophotonic Crescent Moon Structures with Sharp Edge for Ultrasensitive Biomolecular Detection by Local Electromagnetic Field Enhancement Effect

• DOI: 10.1021/nl048232+
• Publication Date: 2005-01-12T06:08:13Z
• Authors: Yu Lu; Gang L. Liu; Jaeyoun Kim; Yara X. Mejia; Luke P. Lee
• Keywords: Nanophotonics; Rhodamine 6G

We present novel gold nanophotonic crescent moon structures with a sub-10 nm sharp edge, which can enhance local electromagnetic field at the edge area. The formation of unconventional structure is accomplished by using sacrificial nanosphere template and conventional thin film deposition method, allows an effective batch nanofabrication precise controls nanostructure shapes. Unique multiple scattering peaks are observed in single nanocrescent dark-field white light illumination. A 785 near-infrared (NIR) diode laser was used as excitation source to induce amplified on moon. Raman spectrum Rhodamine 6G molecules adsorbed characterized, enhancement factor estimated larger than 10(10), suggests potential applications moons ultrasensitive biomolecular detection cellular imaging surface enhanced spectroscopy.