A Grating-Based Plasmon Biosensor With High Resolution

Luo, Ziqian; Suyama, Taikei; Xu, Xun; Okuno, Y.

doi:10.2528/pier11060103

Cited by 11 publications

(9 citation statements)

References 16 publications

(17 reference statements)

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“…This is caused by excitation of plasmon surface waves and is accompanied by an abrupt change of efficiency and phase of a diffracted ray. This is the principle of a grating based plasmon index sensor with phase comparison [1,2], which is a promising way for high resolution measurement of refractive index. However, phase detection is quite complicated in experiment and it requires complexed structure that is difficult to use.…”

Section: Introductionmentioning

confidence: 99%

Resolution of a grating-based plasmon index sensor with efficiency-alone interrogation

Gong

Chen

et al. 2016

2016 Progress in Electromagnetic Research Symposium (PIERS)

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High-resolution measurement of refractive index has a wide range of application and employment of the plasmon resonance absorption combined with phase detection is a promising way to achieve 8-digit resolution. However, because the phase detection in light-wave frequency is not simple, we would like to report on a method of refractive-index measurement by using efficiency-alone interrogation. The basic idea comes from the fact that the TM-wave diffraction efficiency of a metal grating placed in conical mounting can be extremely small at the resonance angle (the polar angle of incidence at which the resonance absorption occurs). We have found in our previous works that (1) there is an appropriate azimuth (a parameter of the conical mounting) determined by a rough value of the index; (2) the TM efficiency at the resonance angle can be 10 −8 or less. Hence, if we use a rotating stage with an instrumental resolution of 1/4000 degrees in finding the resonance angle, the expected resolution in refractive index would be a little less than 7-digit.

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Section: Introductionmentioning

confidence: 99%

Resolution of a grating-based plasmon index sensor with efficiency-alone interrogation

Gong

Chen

et al. 2016

2016 Progress in Electromagnetic Research Symposium (PIERS)

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“…However, because of the weak binding capacity of the glass, due to its flat surface, nano-porous alumina has recently been used to provide a greater sensitivity for gene detection; the reason is that the target molecules can be easily immobilized on the porous material [39]. In addition, phase detection method using a photo-elastic modulator can be employed in the grating-based SPR biosensors to increase the sensing sensitivity [40].…”

Section: Enhancement Of Sensitivity and Surface Electric Fields At Homentioning

confidence: 99%

A RESONANCE TUNABLE AND DURABLE LSPR NANO-PARTICLE SENSOR: AL<sub>2</sub>O<sub>3</sub> CAPPED SILVER NANO-DISKS

Mortazavi¹,

Kouzani²,

Vernon³

2012

PIER

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Abstract-Localized surface plasmon resonance (LSPR) biosensors are employed to detect target biomolecules which have particular resonance wavelengths.Accordingly, tunability of the LSPR wavelength is essential in designing LSPR devices. LSPR devices employing silver nano-particles present better efficiencies than those using other noble metals such as gold; however, silver nano-particles are easily oxidized when they come in contact with liquids, which is inevitable in biosensing applications. To attain both durability and tunabilty in a LSPR biosensor, this paper proposes alumina (Al 2 O 3 ) capped silver nano-disks. It is shown that through controlling the thickness of the cap, the LSPR resonance frequency can be finely tuned over a wide range; and moreover, the cap protects silver nano-particles from oxidation and high temperature.

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“…Plasmonic lens is attracting much interest recently due to its unique feature of exordinary enhanced transmission and super-resolution [6][7] . Plasmonic lens always consisted by metal and dielectric and can excite Surface Plasmon Polarisons (SPPs) [8][9][10] . It means that we can focus the evanescent components of an illuminated object in the near-field region with subdiffraction-limit resolution [11] .…”

mentioning

confidence: 99%

Far-Field Tunable Nano-Focusing Based on Metallic Slits Surrounded With Nonlinear-Variant Widths and Linear-Variant Depths of Circular Dielectric Grating

Cao

Liao

Zhang

et al. 2013

PIER

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Abstract-In this work, we present a new design of a tunable nanofocusing lens using a circular grating of linear-variant depths and nonlinear-variant widths. Constructive interference of cylindrical surface plasmon launched by the subwavelength metallic structure forms a subdiffraction-limited focus, the focal length can be adjusted by varying the geometry of each groove in the circular grating. According to the numerical calculation, the range of focusing points shift is much more than other plasmonic lens, and the relative phase of emitting light scattered by surface plasmon coupling circular grating can be modulated by the nonlinear-variant width and linear-variant depth. The simulation result indicates that the different relative phase of emitting light lead to variant focal length. We firstly show a unique phenomenon for the linear-variant depths and nonlinear-variant widths of the circular grating that the positive change and negative change of the depths and widths of grooves can result in different of variation trend between relative phases and focal lengths. These results paved the road for utilizing the plasmonic lens in high-density optical storage, nanolithography, superresolution optical microscopic imaging, optical trapping, and sensing.

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A Grating-Based Plasmon Biosensor With High Resolution

Cited by 11 publications

References 16 publications

Resolution of a grating-based plasmon index sensor with efficiency-alone interrogation

Resolution of a grating-based plasmon index sensor with efficiency-alone interrogation

A RESONANCE TUNABLE AND DURABLE LSPR NANO-PARTICLE SENSOR: AL<sub>2</sub>O<sub>3</sub> CAPPED SILVER NANO-DISKS

Far-Field Tunable Nano-Focusing Based on Metallic Slits Surrounded With Nonlinear-Variant Widths and Linear-Variant Depths of Circular Dielectric Grating

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