Ultra-high Q/V hybrid cavity for strong light-matter interaction

Conteduca, Donato; Reardon, Christopher; Scullion, Mark G.; Dell’Olio, Francesco; Armenise, Mario Nicola; Krauss, Thomas F.; Ciminelli, Caterina

doi:10.1063/1.4994056

Cited by 52 publications

(54 citation statements)

References 41 publications

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“…Generally, plasmonic nanocavities can achieve a much smaller mode volume than standard optical cavities being them capable of confining the electromagnetic energy far beyond the diffraction limit. [ 53 ] However, plasmonic nanocavities are limited by high intrinsic losses of metals, leading to low quality factor Q . As stated above, the Q ‐factor is related to the dissipation rate of photons confined in the cavity and defined as Q = ω 0 /Δω (where ω 0 is the resonant frequency and Δω is resonant linewidth).…”

Section: Optical Properties Of 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 Properties Of 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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“…Instead of using functionalisation to identify or localise bacteria, we now propose to use optical cavities to trap them. The strong trapping force available with such cavities [7] provides high sensitivity to any changes in the bacterial properties. For example, plasmonic cavities [8] and photonic crystal (PhC) cavities [9,10] have been demonstrated to trap, detect and characterize single-cell bacteria with a very fast and label-free approach [9].…”

Section: Introductionmentioning

confidence: 99%

Monitoring of individual bacteria using electro-photonic traps

Conteduca¹,

Brunetti²,

Dell’Olio³

et al. 2019

Biomed. Opt. Express

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Antimicrobial resistance (AMR) describes the ability of bacteria to become immune to antimicrobial treatments. Current testing for AMR is based on culturing methods that are very slow because they assess the average response of billions of bacteria. In principle, if tests were available that could assess the response of individual bacteria, they could be much faster. Here, we propose an electro-photonic approach for the analysis and the monitoring of susceptibility at the single-bacterium level. Our method employs optical tweezers based on photonic crystal cavities for the trapping of individual bacteria. While the bacteria are trapped, antibiotics can be added to the medium and the corresponding changes in the optical properties and motility of the bacteria be monitored via changes of the resonance wavelength and transmission. Furthermore, the proposed assay is able to monitor the impedance of the medium surrounding the bacterium, which allows us to record changes in metabolic rate in response to the antibiotic challenge. For example, our simulations predict a variation in measurable electrical current of up to 40% between dead and live bacteria. The proposed platform is the first, to our knowledge, that allows the parallel study of both the optical and the electrical response of individual bacteria to antibiotic challenge. Our platform opens up new lines of enquiry for monitoring the response of bacteria and it could lead the way towards the dissemination of a new generation of antibiogram study, which is relevant for the development of a point-of-care AMR diagnostics.

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“…As a last example of application of plasmonic devices, placing a plasmonic nanostructure on top of a photonic crystal resonator can help to enhance the performance of the cavity as a very confined trap with ultra-low excitation power, as shown by Conteduca et al [ 128 ]. The authors realized a gold bow-tie shaped nanoantenna on a 1-D resonator, showing the ability of trapping 100 nm PS and gold nanoparticles, and also exploiting the different shifts of the resonator’s peak due to the different kind of particles, in order to detect the trapping.…”

Section: Evanescent Wave Optical Manipulationmentioning

confidence: 99%

Particle Manipulation by Optical Forces in Microfluidic Devices

et al. 2018

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Since the pioneering work of Ashkin and coworkers, back in 1970, optical manipulation gained an increasing interest among the scientific community. Indeed, the advantages and the possibilities of this technique are unsubtle, allowing for the manipulation of small particles with a broad spectrum of dimensions (nanometers to micrometers size), with no physical contact and without affecting the sample viability. Thus, optical manipulation rapidly found a large set of applications in different fields, such as cell biology, biophysics, and genetics. Moreover, large benefits followed the combination of optical manipulation and microfluidic channels, adding to optical manipulation the advantages of microfluidics, such as a continuous sample replacement and therefore high throughput and automatic sample processing. In this work, we will discuss the state of the art of these optofluidic devices, where optical manipulation is used in combination with microfluidic devices. We will distinguish on the optical method implemented and three main categories will be presented and explored: (i) a single highly focused beam used to manipulate the sample, (ii) one or more diverging beams imping on the sample, or (iii) evanescent wave based manipulation.

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Ultra-high Q/V hybrid cavity for strong light-matter interaction

Cited by 52 publications

References 41 publications

Novel Plasmonic Nanocavities for Optical Trapping‐Assisted Biosensing Applications

Novel Plasmonic Nanocavities for Optical Trapping‐Assisted Biosensing Applications

Monitoring of individual bacteria using electro-photonic traps

Particle Manipulation by Optical Forces in Microfluidic Devices

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