naa a22 4500 510816037 CHVBK 20180411083508.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11468-013-9553-7 doi (NATIONALLICENCE)springer-10.1007/s11468-013-9553-7 Spectral Characteristics of Near-Infrared Surface Plasmon Resonance [Elektronische Daten] [Zhi-mei Qi, Zhe Zhang, Dan-feng Lu, Qian Liu] Intrinsic properties of surface plasmons (SPs) excited with Kretschmann configuration were analyzed as a function of wavelength, including the propagation length, the penetration depth, the Goos-Hänchen (GH) shift, and the field enhancement. The calculated results indicate that there exists a critical thickness (t cr) of the gold layer and that the maximum GH shift occurring exactly at the SP resonance wavelength (λ R) rapidly varies from positive to negative with changing of the gold layer thickness from t < t cr to t > t cr. The maximum field enhancement happens not at λ R but at a wavelength smaller than λ R due to the phase retardation between the transmitted and reflected light. Simulations also reveal that a broadband collimated near-infrared beam can simultaneously excite two SPs with different responses to a refractive index (RI) change: the shorter-wavelength SP able to make a small redshift and the longer-wavelength SP capable of yielding a large blueshift. Only the shorter-wavelength SP was experimentally observed and its RI sensitivity was measured to increase from 3,539nm/RIU at λ R = 707.6nm to 57,143nm/RIU at λ R = 1,398nm. The SP at λ R = 1,013nm moved to λ R = 1,029nm in response to the saturation adsorption of bovine serum albumin, and the corresponding surface coverage was determined to be Γ = 1.565ng/mm2 based on a quasilinear dependence of Γ on the resonance wavelength shift (∆λ R) deduced theoretically. Butyrylcholinesterase adsorption from a dilute solution of 10nM protein in phosphate buffer solution leads to a redshift of ∆λ R = 10nm, corresponding to Γ ≈ 0.97ng/mm2. Springer Science+Business Media New York, 2013 Near-infrared SP nationallicence Resonance wavelength nationallicence Goos-Hänchen shift nationallicence Field enhancement nationallicence Sensitivity nationallicence Qi Zhi-mei State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, No. 19 Beisihuan West Road, 100190, Beijing, China aut Zhang Zhe State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, No. 19 Beisihuan West Road, 100190, Beijing, China aut Lu Dan-feng State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, No. 19 Beisihuan West Road, 100190, Beijing, China aut Liu Qian State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, No. 19 Beisihuan West Road, 100190, Beijing, China aut Plasmonics Springer US; http://www.springer-ny.com 8/3(2013-09-01), 1401-1409 1557-1955 8:3<1401 2013 8 11468 https://doi.org/10.1007/s11468-013-9553-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11468-013-9553-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Qi Zhi-mei State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, No. 19 Beisihuan West Road, 100190, Beijing, China aut NATIONALLICENCE 700 1- Zhang Zhe State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, No. 19 Beisihuan West Road, 100190, Beijing, China aut NATIONALLICENCE 700 1- Lu Dan-feng State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, No. 19 Beisihuan West Road, 100190, Beijing, China aut NATIONALLICENCE 700 1- Liu Qian State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, No. 19 Beisihuan West Road, 100190, Beijing, China aut NATIONALLICENCE 773 0- Plasmonics Springer US; http://www.springer-ny.com 8/3(2013-09-01), 1401-1409 1557-1955 8:3<1401 2013 8 11468 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer