Dr. Ono’s recent research proposes a new concept of quasi-resonance mode of surface plasmon and it contributes to the sensitivity enhancement of the low absorption band of the near-infrared region for Si image sensors. A silver line and space structure fabricated on a typical silicon image sensor was used for the enhancement. As a general concept to improve photon sensitivity, most researchers apply the enhanced electric field excited by surface plasmon resonance. However, this approach is useful for the very limited sensitive region because the incident photons propagate as surface wave and the enhanced electric field is localized as an evanescent field.

In Dr. Ono’s approach, he utilizes slightly shifted resonance conditions, the so-called quasi-resonance of surface plasmons. In the quasi-resonance mode, the coupled photon diffracts at a large angle. If we utilize this in Si image sensors, the incident photons effectively diffract and propagate in Si. The metal grating increases the propagation length in Si absorption layer so that the sensitivity is improved. Dr. Ono will present the details of this concept with simulation results, and he will show the latest experimental results with the prototype.

What You Will Learn:

• New concept of quasi-resonance mode of surface plasmon polaritons
• Research related to the sensitivity improvement of Si image sensors in the near-infrared region
• Recent research activities of plasmonic color filters

Who Should Attend:

• Nanophotonics researchers

About the Presenter: Atsushi Ono, Shizuoka University, Japan

Dr. Atsushi Ono received the B.S., M.S., and Ph.D. degrees in applied physics from Osaka University, Osaka, Japan, in 2001, 2003, and 2006, respectively. In 2006, he joined RIKEN as the special postdoctoral researcher. Since 2009, he has been an assistant professor of tenure track in the Division of Global Research Leaders, Shizuoka University. In 2013, he was appointed Associate Professor in Engineering Department of Shizuoka University, and he was promoted to full Professor in 2021. He has been focusing on research of near-field optics and plasmonics.