From Near-Field to Far-Field Coupling in the Third Dimension: Retarded Interaction of Particle Plasmons

Taubert, R.; Ameling, Ralf; Weiß, Thomas; Christ, A.; Gießen, Harald

doi:10.1021/nl202606g

Cited by 61 publications

(74 citation statements)

References 28 publications

(36 reference statements)

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“…This near-field-coupling-induced peak shift is highly dependent on the interparticle distance. As the interparticle gap becomes smaller, larger coupling will be achieved; the coupling decays exponentially with an increasing interparticle gap [31][32][33][34]. Based on this principle, diverse chemical and biological sensors have been developed [35][36][37], including sensors built on the target-guided aggregation of nanoparticles, which induces a redshift in the plasmon extinction band, and sensors utilizing the dissociation of pre-aggregates of nanoparticles in the presence of target, which induces a blueshift [38].…”

Section: Introductionmentioning

confidence: 99%

Strategies for enhancing the sensitivity of plasmonic nanosensors

et al. 2015

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Based on the localized surface plasmon resonance (LSPR) of metallic nanoparticles, plasmonic nanosensors have emerged as a powerful tool for biosensing applications. Many detection schemes have been developed and the field is rapidly growing to incorporate new methodologies and applications. Amidst all the ongoing research efforts, one common factor remains a key driving force: continued improvement of high-sensitivity detection. Although there are many excellent reviews available that describe the general progress of LSPR-based plasmonic biosensors, there has been limited attention to strategies for improving the sensitivity of plasmonic nanosensors. Recognizing the importance of this subject, this review highlights recent progress on different strategies used for improving the sensitivity of plasmonic nanosensors. These strategies are classified into the following three categories based on their different sensing mechanisms: (1) sensing based on target-induced local refractive index changes, (2) colorimetric sensing based on LSPR coupling, and (3) amplification of detection sensitivity based on nanoparticle growth. The basic principles and cutting-edge examples are provided for each kind of strategy, collectively forming a unifying framework to view the latest attempts to improve the sensitivity of nanoplasmonic sensors. Future trends for the fabrication of improved plasmonic nanosensors are also discussed.

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Section: Introductionmentioning

confidence: 99%

Strategies for enhancing the sensitivity of plasmonic nanosensors

et al. 2015

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“…Eigenmodes of various nanoantennas have been measured by different means [17][18][19][20][21][22][23][24][25] . However, problematic in further advancing the field is the lack of analytical insight into the scaling behavior of optical nanoantennas to carefully design them for a desired application [26][27][28][29][30] .…”

Section: Introductionmentioning

confidence: 99%

Circular optical nanoantennas: an analytical theory

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Rockstuhl

et al. 2012

Phys. Rev. B

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An analytical approach is provided for describing the resonance properties of optical nanoantennas made of a stack of homogeneous discs, i.e. circular patch nanoantennas. It consists in analytically calculating the phase accumulation of surface plasmon polaritons across the resonator and an additional contribution from the complex reflection coefficient at the antenna termination. This makes the theory self-contained with no need for fitting parameters. The very antenna resonances are then explained by a simple Fabry-Perot resonator model. Predictions are compared to rigorous simulations and show excellent agreement. Using this analytical model, circular antennas can be tuned by varying the composition of the stack.

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“…Generally, the standard FOM value of plasmonic sensors is defined as FOM=S (nm RIU −1 )/FWHM (nm) or FOM E =S (eV RIU −1 )/FWHM (eV), where S (nm RIU −1 ) and S (eV RIU −1 ) refer to the sensitivities to the refractive index change in wavelength unit and energy unit, respectively, and FWHM (nm) and FWHM (eV) refer to the linewidths of the plasmonic resonance in wavelength unit and energy unit, respectively. The maximum values of FOM of the LSPR-WA(1) eff mode are determined to be 36 (38) and 32 (31) for the RI ranges of 1.333~1.398 (D2) and 1.398~1.443 (D3) in wavelength (energy) unit, respectively (the detailed sensing data are shown in Table 1), which surpass the values for most of plasmonic sensors, including metal nanoparticle-based sensors and a number of the LSPRrelated sensors using Fano resonance under normal incidence [37,38,[44][45][46][47][48]. DDMG is somewhat similar to the gold mushroom array (GMRA) in two-dimensional structure we reported previously [21].…”

Section: Resultsmentioning

confidence: 99%

“…Double-layered metal gratings have been extensively studied in various aspects, including negative refraction [29], Fano resonance [30], vertical farfield coupling [31], tailoring of the intensity, and phase delay in extraordinary optical transmission [32,33]. However, the design of double-layered metal gratings for sensing has rarely been explored.…”

Section: Introductionmentioning

confidence: 99%

Dislocated Double-Layered Metal Gratings: Refractive Index Sensors with High Figure of Merit

et al. 2015

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We experimentally demonstrate an enhanced refractive index sensing using a dislocated double-layered metal grating (DDMG). The DDMG is capable of supporting a novel guided mode caused by the interaction between localized surface plasmon resonances (LSPRs) from the individual gold stripes and Wood's anomaly in the dielectric grating layer between two gold gratings. We show that this guided mode can only be induced and mediated by the coupling of lattice plasmon resonances sustained by upper and lower gold grating through introducing a lateral displacement between the two gold gratings. The DDMG provides an experimental figure of merit (FOM) value up to 36 under normal incidence, which is superior to those of most of nanoplasmonic sensors relying on Fano resonances. Additionally, the DDMGs can be fabricated by a very simple and cost-effective method via a combination of two-beam interference lithography and metal deposition. Accompanied with high FOM and simple detection scheme, this sensor will be found in a wide range of applications in biomedical sensing.

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From Near-Field to Far-Field Coupling in the Third Dimension: Retarded Interaction of Particle Plasmons

Cited by 61 publications

References 28 publications

Strategies for enhancing the sensitivity of plasmonic nanosensors

Strategies for enhancing the sensitivity of plasmonic nanosensors

Circular optical nanoantennas: an analytical theory

Dislocated Double-Layered Metal Gratings: Refractive Index Sensors with High Figure of Merit

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