TY - JOUR
T1 - Spectroscopic imaging of photoexcited states at a polycrystalline copper metal surface via two-photon photoelectron emission microscopy
AU - Shibuta, Masahiro
AU - Nakajima, Atsushi
N1 - Funding Information:
This work is partly supported by JSPS KAKENHI of Grants-in-Aid for Scientific Research (A) No. 19H00890 and Scientific Research (C) No. 18K04942, for Challenging Research Nos. 17H06226 and 21K18939, and for Transformative Research Areas (A) “Hyper–Ordered Structures Science” (21H05573).
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/10
Y1 - 2022/10
N2 - The local photoexcited surface states of a polycrystalline-copper (Cu) substrate were observed via two-photon photoelectron emission microscopy (2P-PEEM) using a femtosecond laser. The 2P-PEEM results revealed local distributions of the photoexcited electrons, strongly depending on the crystal domains. With the energy-filtered images, the local 2P-photoemission spectra were selectively obtained for (1 1 1)- and (1 1 0)/(1 0 0)-crystal domains. Furthermore, the 2P-PEEM could visualize propagating Cu surface plasmon polaritons with wavevector of 7.61 × 106 m−1. These results indicate that the 2P-PEEM technique is a promising tool for studying the distribution of nonequivalent photoexcited surface states for various inhomogeneous functional nanomaterials.
AB - The local photoexcited surface states of a polycrystalline-copper (Cu) substrate were observed via two-photon photoelectron emission microscopy (2P-PEEM) using a femtosecond laser. The 2P-PEEM results revealed local distributions of the photoexcited electrons, strongly depending on the crystal domains. With the energy-filtered images, the local 2P-photoemission spectra were selectively obtained for (1 1 1)- and (1 1 0)/(1 0 0)-crystal domains. Furthermore, the 2P-PEEM could visualize propagating Cu surface plasmon polaritons with wavevector of 7.61 × 106 m−1. These results indicate that the 2P-PEEM technique is a promising tool for studying the distribution of nonequivalent photoexcited surface states for various inhomogeneous functional nanomaterials.
KW - Copper metal surface
KW - Femtosecond laser
KW - Image potential state
KW - Photoelectron emission microscopy
KW - Surface plasmon polariton
KW - Two-photon photoemission
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U2 - 10.1016/j.cplett.2022.139909
DO - 10.1016/j.cplett.2022.139909
M3 - Article
AN - SCOPUS:85135392034
SN - 0009-2614
VL - 804
JO - Chemical Physics Letters
JF - Chemical Physics Letters
M1 - 139909
ER -