Acousto-optic surface-plasmon resonance measurements of thin films on gold

Abstract

Articles you may be interested inTime-resolved optical measurement of thermal transport by surface plasmon polaritons in thin metal stripes Appl. Phys. Lett. 105, 191119 (2014); 10.1063/1.4901956 Femtosecond laser-ultrasonic investigation of plasmonic fields on the metal/gallium nitride interface Appl. Phys. Lett. 97, 201102 (2010); 10.1063/1.3503633 Surface-plasmon enhancement of band gap emission from ZnCdO thin films by gold particles Appl. Phys. Lett. 97, 061104 (2010); 10.1063/1.3476357 Surface-plasmon resonance sensing of alcohol with electrodeposited polythiophene and gold nanoparticleoligothiophene films J. Appl. Phys. 98, 114314 (2005); 10.1063/1.2138373 Near-field magneto-optical microscopy using surface-plasmon waves and the transverse magneto-optical Kerr effect J. Appl. Phys. 98, 093904 (2005);In this work a highly sensitive optical technique was used to study the adsorption of thin organic layers onto a gold film from water, in situ and in real-time. Optical excitation of a surface-plasmon resonance ͑SPR͒ was used to probe the gold/water interface. The use of an acousto-optic tunable filter then provides a differential technique for monitoring the SPR position in optical wavelength. This allows optical changes at the metal/liquid interface to be measured as the adsorption of thin organic layers occurs. Adsorption of a poly͑ethylene glycol͒ monododecyl ether surfactant (C 12 E 8 ) and a 30-mer DNA oligonucleotide with a mercaptohexyl group at the 5Ј-phosphate end ͑DNA-SH͒ onto gold from water were examined. Conventional, angle-dependent reflectivity measurements taken on the same system provided complementary SPR data, allowing the sensitivity of the two techniques to be compared.

High resolution surface plasmon resonance spectroscopy

“…The above setups involve reflection intensity versus incident angle ͑an angle-scan system͒; SPR has also been detected by modulating the wavelength of incident light. 11,12 The wavelength modulation causes modulation in the reflection intensity which is monitored with a lock-in amplifier and provides an accurate measurement of the SPR dip position. Using an acousto-optic tunable filter ͑AOTF͒, it was demonstrated that a wavelength change of 0.0005 nm, 11 corresponding to 5ϫ10 Ϫ7 RIU at a wavelength of 630 nm, 1 can be detected.…”

Surface Plasmon Resonance Tunability in Au−VO2 Thermochromic Nano-composites

“…These changes form the basis of numerous spectroscopy probing methods. Recently, within the expansion of the multidisciplinary field of Nanosciences, this surface plasmon resonance effect, involving noble metals, is frequently used for biosensing to monitor binding and changes in biological molecules (3)(4) and to improve immunolabeling (5). Likewise, it is used for ultra-low doses gas sensing and bio-hazardous gases identification (6) as well as high-sensitivity electrochemical studies (7).…”

Assembly process of CuHCF/MPA multilayers on gold nanoparticles modified electrode and characterization by electrochemical SPR

“…The technique offers real-time and label-free detection with high sensitivity, allowing measurements of analyte concentration and binding kinetics. It has wide application in amino acid sequencing [24], single nucleotide polymorphism analysis [25], protein conformation studies [26], and cell/ligand interactions [27]. As a probe of film dielectric properties, film thickness, and morphology, SPR has also been used to probe the film nanostructure [28].…”