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Dissertation Talk: Engineering Optical Antenna for Efficient Local Field Enhancement

Seminar: Departmental | December 14 | 1-2 p.m. | Cory Hall, 521 (Hogan Room)

Tae Joon Seok

Electrical Engineering and Computer Sciences (EECS)

Optical antennas have been widely used for variety of applications such as sensitive photodetection, efficient light emission, high resolution imaging, heat-assisted magnetic recording, and surface-enhanced Raman spectroscopy (SERS) since they can capture and focus propagating electromagnetic energy into sub-diffraction-limited area, and vice versa. However, widespread application of optical antennas has been limited due to lack of appropriate methods for uniform and large area fabrication of antennas as well as difficulty in achieving an efficient design with small mode volume (gap spacing < 10nm).

In this dissertation, we present a novel optical antenna design, arch-dipole antenna, with optimal radiation efficiency and small mode volume, 5 nm gap spacing, fabricated by CMOS-compatible deep-UV spacer lithography. We demonstrate strong surface-enhanced Raman spectroscopy (SERS) signal with an enhancement factor exceeding 108 from the arch-dipole antenna array, which is two orders of magnitude stronger than that from the standard dipole antenna array fabricated by e-beam lithography. Since the antenna gap spacing, the critical dimension of the antenna, can be defined by deep-UV lithography, efficient optical antenna arrays with sub-10 nm gap can be mass-produced using current CMOS technology., 510-642-1023