Optical resonances in microcylinders: response to perturbations for biosensing

Chantada, Laura; Nikolaev, N. I.; Ivanov, A. L.; Borri, Paola; Langbein, Wolfgang Werner

doi:10.1364/josab.25.001312

Cited by 45 publications

(44 citation statements)

References 17 publications

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“…This effect is the basis for resonant optical biosensing. 7,10,11 The changes in the spectral properties of resonators in the presence of perturbations can be used to characterize the size and shape of the attached nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Resonant state expansion applied to two-dimensional open optical systems

2013

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The resonant state expansion (RSE), a rigorous perturbative method in electrodynamics, is applied to two-dimensional open optical systems. The analytically solvable homogeneous dielectric cylinder is used as unperturbed system, and its Green's function is shown to contain a cut in the complex frequency plane, which is included in the RSE basis. The complex eigenfrequencies of modes are calculated using the RSE for a selection of perturbations which mix unperturbed modes of different orbital momentum, such as half-cylinder, thin-film and thin-wire perturbation, demonstrating the accuracy and convergency of the method. The resonant states for the thin-wire perturbation are shown to reproduce an approximative analytical solution.

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Section: Introductionmentioning

confidence: 99%

Resonant state expansion applied to two-dimensional open optical systems

2013

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“…Furthermore, combining the dissipative and reactive sensing methods, more information of the analyte can be obtained, and those two kinds of signal may verify with each other and confirm the reliability of the detection results. Note that the linewidth change induced by the absorption loss differs from the mode broadening resulting from additional scattering loss and unresolvable splitting in the optical spectrum [26,29,53]. In this work, we thus propose and demonstrate to detect single lossy nanoparticles via the dissipative interaction with a toroidal optical microcavity which supports high-Q optical whisperinggallery modes (WGMs).…”

Section: Introductionmentioning

confidence: 99%

“…Optical microcavities featuring high-Q factors and small mode volumes, such as Fabry-Perot cavities [3], photonic crystals [4,5], microspheres [6][7][8][9], microrings [10][11][12][13][14], microtoroids [15][16][17], microbubbles [18][19][20], and microtubes [21,22] have been widely investigated in sensing applications. In general, the microcavity sensing depends mainly on reactive (i.e., dispersive) interactions, resulting in a resonance wavelength shift [23][24][25][26] or mode splitting [26,27], which essentially responds to the real part of the polarizability of the targets. Via reactive sensing, a single virus [28,29] and a single nanoparticle [30][31][32][33] have been detected experimentally.…”

Section: Introductionmentioning

confidence: 99%

Detection of Single Nanoparticles Using the Dissipative Interaction in a High-QMicrocavity

Shen

Zhi

et al. 2016

Phys. Rev. Applied

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Ultrasensitive optical detection of nanometer-scaled particles is highly desirable for applications in early-stage diagnosis of human diseases, environmental monitoring, and homeland security, but remains extremely difficult due to ultralow polarizabilities of small-sized, low-index particles. Optical whispering-gallery-mode microcavities, which can enhance significantly the light-matter interaction, have emerged as promising platforms for label-free detection of nanoscale objects. Different from the conventional whispering-gallery-mode sensing relying on the reactive (i.e., dispersive) interaction, here we propose and demonstrate to detect single lossy nanoparticles using the dissipative interaction in a high-Q toroidal microcavity. In the experiment, detection of single gold nanorods in an aqueous environment is realized by monitoring simultaneously the linewidth change and shift of the cavity mode. The experimental result falls within the theoretical prediction. Remarkably, the reactive and dissipative sensing methods are evaluated by setting the probe wavelength on and off the surface plasmon resonance to tune the absorption of nanorods, which demonstrates clearly the great potential of the dissipative sensing method to detect lossy nanoparticles. Future applications could also combine the dissipative and reactive sensing methods, which may provide better characterizations of nanoparticles.

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“…By detecting the shift of WGMs, the ultra-sensitive size sensing can be realized [12][13][14]. In addition, the dispersion of nanoparticles will induce the mode splitting [15][16][17][18][19][20][21][22][23][24][25][26][27] or mode broadening [28][29][30], and will also cause the linewidth change [31] which can be used for size sensing as well.…”

Section: Introductionmentioning

confidence: 99%

Mass sensing by detecting the quadrature of a coupled light field

Lin

Xiao

2017

Phys. Rev. A

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Ultrasensitive detections have been proposed as an application of optomechanical systems. Here we develop an approach to mass sensing by comparing the detected quadratures of light field coupled to a mechanical resonator, whose slight change of the mass should be precisely measured. The change in the mass of the mechanical resonator will cause the detectable difference in the evolved quadrature of the light field, to which the mechanical oscillator is coupled. It is shown that the ultra-small change ∆m from a mass m can be detected up to the ratio ∆m/m ∼ 10 −8 − 10 −7 by choosing the feasible system parameters.

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Optical resonances in microcylinders: response to perturbations for biosensing

Cited by 45 publications

References 17 publications

Resonant state expansion applied to two-dimensional open optical systems

Resonant state expansion applied to two-dimensional open optical systems

Detection of Single Nanoparticles Using the Dissipative Interaction in a High-QMicrocavity

Mass sensing by detecting the quadrature of a coupled light field

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