Plasmon-Assisted Optoelectrofluidics

Ndukaife, Justus C.; Kildishev, Alexander V.; Nnanna, A. G. Agwu; Wereley, Steven T.; Shalaev, Vladimir M.; Boltasseva, Alexandra

doi:10.1364/cleo_at.2015.aw3k.5

Cited by 39 publications

(51 citation statements)

References 4 publications

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“…Finally, plasmonic optical tweezers have the potentials to be combined with other opto‐electronic devices which would lead to novel applications. [ 86–88 ] However, because of photothermal effects, plasmonic trapping is limited to specific object sizes, which are estimated to be ≥100 nm. [ 67,71,80 ] These observations imply the existence of a clear trade‐off between the size of a particle to be trapped, its spatial confinement, and the intensities required to trap the nanoparticle.…”

Section: Optical Trapping In Plasmonic Nanocavitiesmentioning

confidence: 99%

Novel Plasmonic Nanocavities for Optical Trapping‐Assisted Biosensing Applications

Koya

Cunha

Guo

et al. 2020

Advanced Optical Materials

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However, due to the intrinsic low optical response of small objects, there has been a clear trade-off between the size of a material and its response to light. [5] Recently, plasmonic nanostructures have emerged as leading platforms to enhance the weak optical signals of low dimensional materials including quantum dots (QDs), [6] small molecules, [7,8] and 2D monolayers. [9] The plasmonic enhancement of linear and nonlinear optical processes capitalizes on the near-and far-field properties of metallic (e.g., gold and silver) nanostructures. [10] One of the defining features of plasmonic nanostructures is their potential to confine light into deep subwavelength volumes, which has opened a new door to trap and manipulate dielectric, metallic, and biological nano-objects. [11] Moreover, metallic nanostructures are characterized by their capability to amplify the intensity of optical fields by orders of magnitude. The enhancement of local field intensity is attributed to the resonance of plasmon polaritons arising from the coupling of external electromagnetic fields to the collective oscillations of the conduction electrons. [12] A small perturbation (or change in the refractive index) of the near field zone of plasmonic nanostructures leads to significant shift in the plasmon polariton resonance wavelength, which has important implications for surface-enhanced sensing and spectroscopic applications. [13,14] Thus, for the ad-hoc enhancement of optical Plasmonic nanocavities have proved to confine electromagnetic fields into deep subwavelength volumes, implying their potentials for enhanced optical trapping and sensing of nanoparticles. In this review, the fundamentals and performances of various plasmonic nanocavity geometries are explored with specific emphasis on trapping and detection of small molecules and single nanoparticles. These applications capitalize on the local field intensity, which in turn depends on the size of plasmonic nanocavities. Indeed, properly designed structures provide significant local field intensity and deep trapping potential, leading to manipulation of nano-objects with low laser power. The relationship between optical trappinginduced resonance shift and potential energy of plasmonic nanocavity can be analytically expressed in terms of the intercavity field intensity. Within this framework, recent experimental works on trapping and sensing of single nanoparticles and small molecules with plasmonic nanotweezers are discussed. Furthermore, significant consideration is given to conjugation of optical tweezers with Raman spectroscopy, with the aim of developing innovative biosensors. These devices, which take the advantages of plasmonic nanocavities, will be capable of trapping and detecting nanoparticles at the single molecule level.

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Section: Optical Trapping In Plasmonic Nanocavitiesmentioning

confidence: 99%

Novel Plasmonic Nanocavities for Optical Trapping‐Assisted Biosensing Applications

Koya

Cunha

Guo

et al. 2020

Advanced Optical Materials

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“…[131] Single MS2 viruses are also detected using a silica microsphere with a gold nanoshell adsorbed on the cavity equator ( Figure 11e). [137] Another possible method to enhance the sensitivity is to expose a stronger field to the surroundings by coating the cavity with a higher-refractiveindex layer. The existence of two groups of mode shifts similar to that shown in Figure 11c is not reported, because the signal of the individual virus binding to the bare cavity is below the background noise.…”

Section: Sensitivity Enhancementmentioning

confidence: 99%

Single Nanoparticle Detection Using Optical Microcavities

et al. 2017

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Detection of nanoscale objects is highly desirable in various fields such as early-stage disease diagnosis, environmental monitoring and homeland security. Optical microcavity sensors are renowned for ultrahigh sensitivities due to strongly enhanced light-matter interaction. This review focuses on single nanoparticle detection using optical whispering gallery microcavities and photonic crystal microcavities, both of which have been developing rapidly over the past few years. The reactive and dissipative sensing methods, characterized by light-analyte interactions, are explained explicitly. The sensitivity and the detection limit are essentially determined by the cavity properties, and are limited by the various noise sources in the measurements. On the one hand, recent advances include significant sensitivity enhancement using techniques to construct novel microcavity structures with reduced mode volumes, to localize the mode field, or to introduce optical gain. On the other hand, researchers attempt to lower the detection limit by improving the spectral resolution, which can be implemented by suppressing the experimental noises. We also review the methods of achieving a better temporal resolution by employing mode locking techniques or cavity ring up spectroscopy. In conclusion, outlooks on the possible ways to implement microcavity-based sensing devices and potential applications are provided.

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“…Various techniques including self‐induced back‐action trapping, integration of heat sinks, and drastic reduction of sample chamber thickness have been used to alleviate such thermal effects. Despite the issue of thermodisturbance, optothermal effects have been demonstrated in several trapping experiments in the past 5 years, including plasmonic nanoantenna‐assisted trapping with an AC electric field and trapping in a thermally absorptive medium . Additionally, Kang et al utilized the plasmonic optothermophoretic effect to perform optical manipulation in a microfluidic platform .…”

Section: Introductionmentioning

confidence: 99%

Thermal Optofluidics: Principles and Applications

Chen

Loo

Wang

et al. 2019

Advanced Optical Materials

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Thermal optofluidics is an emerging field that promises to create numerous research and application opportunities in biophysics, biochemistry, and clinical biology. Innovation in plasmonic optics has led to the development of various invaluable tools in the fields of biosensing and microfluidic manipulation. The optothermal effect originates from light–matter interactions during photon–phonon conversion, which can lead to micro‐ or nanoscale inhomogeneities in the thermal distribution. This further induces a series of hydrodynamic phenomena such as natural convection, Marangoni convection, thermophoresis, the electrolyte Seebeck effect, depletion forces, and interfacial effects in colloidal particles. Light–matter interactions are particularly important for three aspects of microfluidics, namely the motion of colloidal particles, fluidic actuation, and biochemical reactions. This review first systematically elucidates the role of both nanoscale plasmonic thermal generation and heat‐induced fluidic motion in optofluidic microsystems. Then, recent state‐of‐the‐art thermal optofluidic applications of the above‐listed three aspects are presented. The paper aims to provide an insightful reference for future research in optofluidic biochemical systems.

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Plasmon-Assisted Optoelectrofluidics

Cited by 39 publications

References 4 publications

Novel Plasmonic Nanocavities for Optical Trapping‐Assisted Biosensing Applications

Novel Plasmonic Nanocavities for Optical Trapping‐Assisted Biosensing Applications

Single Nanoparticle Detection Using Optical Microcavities

Thermal Optofluidics: Principles and Applications

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