TY - JOUR
T1 - Plasmonic Nanocrystal Arrays on Photonic Crystals with Tailored Optical Resonances
AU - Wang, Juan
AU - Le-The, Hai
AU - Karamanos, Theodosios
AU - Suryadharma, Radius N.S.
AU - van den Berg, Albert
AU - Pinkse, Pepijn W.H.
AU - Rockstuhl, Carsten
AU - Shui, Lingling
AU - Eijkel, Jan C.T.
AU - Segerink, Loes I.
PY - 2020/8
Y1 - 2020/8
N2 - Hierarchical plasmonic-photonic microspheres (PPMs) with high controllability in their structures and optical properties have been explored toward surface-enhanced Raman spectroscopy. The PPMs consist of gold nanocrystal (AuNC) arrays (3rd-Tier) anchored on a hexagonal nanopattern (2nd-Tier) assembled from silica nanoparticles (SiO2NPs) where the uniform microsphere backbone is termed the 1st-Tier. The PPMs sustain both photonic stop band (PSB) properties, resulting from periodic SiO2NP arrangements of the 2nd-Tier, and a surface plasmon resonance (SPR), resulting from AuNC arrays of the 3rd-Tier. Thanks to the synergistic effects of the photonic crystal (PC) structure and the AuNC array, the electromagnetic (EM) field in such a multiscale composite structure can tremendously be enhanced at certain wavelengths. These effects are demonstrated by experimentally evaluating the Raman enhancement of benzenethiol (BT) as a probe molecule and are confirmed via numerical simulations. We achieve a maximum SERS enhancement factor of up to â108 when the resonances are tailored to coincide with the excitation wavelength by suitable structural modifications.
AB - Hierarchical plasmonic-photonic microspheres (PPMs) with high controllability in their structures and optical properties have been explored toward surface-enhanced Raman spectroscopy. The PPMs consist of gold nanocrystal (AuNC) arrays (3rd-Tier) anchored on a hexagonal nanopattern (2nd-Tier) assembled from silica nanoparticles (SiO2NPs) where the uniform microsphere backbone is termed the 1st-Tier. The PPMs sustain both photonic stop band (PSB) properties, resulting from periodic SiO2NP arrangements of the 2nd-Tier, and a surface plasmon resonance (SPR), resulting from AuNC arrays of the 3rd-Tier. Thanks to the synergistic effects of the photonic crystal (PC) structure and the AuNC array, the electromagnetic (EM) field in such a multiscale composite structure can tremendously be enhanced at certain wavelengths. These effects are demonstrated by experimentally evaluating the Raman enhancement of benzenethiol (BT) as a probe molecule and are confirmed via numerical simulations. We achieve a maximum SERS enhancement factor of up to â108 when the resonances are tailored to coincide with the excitation wavelength by suitable structural modifications.
KW - Localized surface plasmon resonance
KW - Photonic stop band
KW - Plasmonic−photonic microsphere
KW - Slow light effect
KW - Surface-enhanced Raman spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=85089714600&partnerID=8YFLogxK
U2 - 10.1021/acsami.0c05596
DO - 10.1021/acsami.0c05596
M3 - Article
C2 - 32814417
AN - SCOPUS:85089714600
SN - 1944-8244
VL - 12
SP - 37657
EP - 37669
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
IS - 33
ER -