Measurement of a saturated emission of optical radiation from gold nanoparticles: application to an ultrahigh resolution microscope.
We show that scattering from a single gold nanoparticle is saturable for the first time. Wavelength-dependent study reveals that the saturation behavior is governed by depletion of surface plasmon resonance, not the thermal effect. We observed interesting flattening of the point spread function of scattering from a single nanoparticle due to saturation. By extracting the saturated part of scattering via temporal modulation, we achieve λ/8 point spread function in far-field imaging with unambiguous separation of adjacent particles.
Department of Physics, National Taiwan University, Taipei 10617, Taiwan, Republic of China and Molecular Imaging Center, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
Shi-Wei
SW
Chu
Department of Physics, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
Tung-Yu
TY
Su
Department of Applied Physics, Osaka University, 565-0871 Osaka, Japan.
Ryosuke
R
Oketani
Department of Physics, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
Yen-Ta
YT
Huang
Department of Physics, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
Hsueh-Yu
HY
Wu
Department of Applied Physics, Osaka University, 565-0871 Osaka, Japan.
Yasuo
Y
Yonemaru
Department of Applied Physics, Osaka University, 565-0871 Osaka, Japan.
Masahito
M
Yamanaka
Department of Physics, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
Hsuan
H
Lee
Department of Physics, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
Guan-Yu
GY
Zhuo
Department of Physics, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
Ming-Ying
MY
Lee
Department of Applied Physics, Osaka University, 565-0871 Osaka, Japan.
Satoshi
S
Kawata
Department of Applied Physics, Osaka University, 565-0871 Osaka, Japan.
Katsumasa
K
Fujita
D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008853:Microscopy / Q000295:instrumentation; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods; D020349:Surface Plasmon Resonance / Q000295:instrumentation* / Q000379:methods*
D006046:Gold