Coupling analysis of high Q resonators in add-drop configuration through cavity ringdown spectroscopy

Frigenti, Gabriele; Arjmand, Mojtaba; Barucci, Andrea; Baldini, Francesco; Berneschi, Simone; Farnesi, Daniele; Gianfreda, Mariagiovanna; Pelli, S.; Soria, Silvia; Aray, Ayda; Dumeige, Yannick; Féron, Patrice; Conti, Gualtiero Nunzi

doi:10.1088/2040-8986/aac459

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…What has motivated these efforts is their ability to confine the light to a certain volume by virtue of a multilayer structure or total internal reflection. Moreover, optical cavities enable myriad applications such as temperature and pressure [1,2], gas sensors [3,4], refractive index sensors [5,6], spectroscopy [7][8][9], and on-chip filters [10], to mention a few. Additionally, multilayer configurations are exploited in liquid crystal display, augmented reality, and virtual reality [11,12].…”

Section: Introductionmentioning

confidence: 99%

Modeling and characterization of deeply etched multilayer resonators under partial coherent excitation via multimode optical fibers

A Selim,

Sabry,

Marty

et al. 2024

J. Opt.

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Recently, there has been a resurgence of interest in multimode optical fibers illuminated by a white light source. Largely, in anticipation of many integrated applications in the biomedical domain and spectral sensing benefiting from the broad spectral range and high numerical aperture. Along these lines, the output light from these fibers can be captured by the physics of partially coherent sources. While the Gaussian Schell model has provided a framework for studying partial coherence, to our knowledge, its impact on microstructures remains unexplored. As the sheer complexity arising from the interplay between partial coherence and microstructures transfer function has posed fundamental challenges in deciphering their response. In this work, we introduce a comprehensive numerical model paired with experimental validation to assess the performance of multilayer optical resonators, which are meticulously crafted through high aspect ratio silicon etching under the influence of a partially coherent optical source. The model studies the effects of optical fiber numerical aperture, Bragg mirror order, cavity length, and surface roughness of the microstructures on the output of the resonator. The results show that the response under standard multimode fiber (partial coherent source) has lower insertion loss, more asymmetry versus wavelength, and larger full width at half maximum (FWHM) than the standard single mode fiber (full coherent source). A silicon-on-insulator chip is fabricated using 130-µm deep etching of silicon for Bragg mirrors with 2.25, 3, and 3.25 µm silicon layer widths and a different number of layers. The structures are characterized using a multimode fiber of 62.5-µm core diameter illuminated by an infrared white light source. The theoretical results have been compared with the experimental results and a good agreement has been obtained.

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Section: Introductionmentioning

confidence: 99%

Modeling and characterization of deeply etched multilayer resonators under partial coherent excitation via multimode optical fibers

A Selim,

Sabry,

Marty

et al. 2024

J. Opt.

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“…(a) WGM resonance used for this experiment (blue curve) along with an overall fit (red curve, theoretical shape according to[41]). (b) Enlargement of the half-maximum work-point, showing that the parabolic fit (green curve) allows a more faithful representation of the WGM fringe (blue curve) with respect to the overall fit (red curve).…”

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confidence: 99%

Microbubble Resonators for All-Optical Photoacoustics of Flowing Contrast Agents

Frigenti

Cavigli

Fernández-Bienes

et al. 2020

Sensors

Self Cite

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In this paper, we implement a Whispering Gallery mode microbubble resonator (MBR) as an optical transducer to detect the photoacoustic (PA) signal generated by plasmonic nanoparticles. We simulate a flow cytometry experiment by letting the nanoparticles run through the MBR during measurements and we estimate PA intensity by a Fourier analysis of the read-out signal. This method exploits the peaks associated with the MBR mechanical eigenmodes, allowing the PA response of the nanoparticles to be decoupled from the noise associated with the particle flow whilst also increasing the signal-to-noise ratio. The photostability curve of a known contrast agent is correctly reconstructed, validating the proposed analysis and proving quantitative PA detection. The experiment was run to demonstrate the feasible implementation of the MBR system in a flow cytometry application (e.g., the detection of venous thrombi or circulating tumor cells), particularly regarding wearable appliances. Indeed, these devices could also benefit from other MBR features, such as the extreme compactness, the direct implementation in a microfluidic circuit, and the absence of impedance-matching material.

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Phoxonic glass cavities based on whispering gallery mode resonators

Farnesi

Berneschi

Frigenti

et al. 2021

Optical Materials: X

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Coupling analysis of high Q resonators in add-drop configuration through cavity ringdown spectroscopy

Cited by 5 publications

References 32 publications

Modeling and characterization of deeply etched multilayer resonators under partial coherent excitation via multimode optical fibers

Modeling and characterization of deeply etched multilayer resonators under partial coherent excitation via multimode optical fibers

Microbubble Resonators for All-Optical Photoacoustics of Flowing Contrast Agents

Phoxonic glass cavities based on whispering gallery mode resonators

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