[21p-E208-1~9] 3.12 Nanoscale optical science and near-field optics

[21p-E208-8] Enhancement of signal intensity of inverse photoelectron spectroscopy by grating-coupled surface plasmon resonance

〇(M1)Koki Shibata¹, Keiko Tawa², Hiroyuki Yoshida^1,3 (1.Chiba Univ., 2.Kwansei Gakuin Univ., 3.Chiba Chirality)

Keywords:plasmonics, inverse photoelectron spectroscopy, grating

Inverse photoelectron spectroscopy (IPES) is among the most powerful technique to observe the unoccupied states of condensed matter. IPES is often regarded as the inversion process of and complimentary to photoelectron spectroscopy (PES) which examine the occupied states. However, the signal intensity of IPES is 5 orders of magnitude smaller than that of PES. In this study, we enhance the signal intensity of IPES by the grating-coupled surface plasmon resonance (GCSPR) of Al. In order to couple the photon energy of IPES with that of surface plasmon resonance of Al, low-energy inverse photoelectron spectroscopy (LEIPS) was employed. The LEIPS signal intensity of Al is enhanced by a factor of 1.8 at 285 nm and 1.9 at 434 nm. We also examined photon energy dependence of LEIPS intensity which is in good agreement with the predicted values. We therefore conclude that the signal intensity of IPES is enhanced by GCSPR of Al.