Gain-assisted broadband ring cavity enhanced spectroscopy

Selim, Mahmoud A.; Adib, George A.; Sabry, Yasser M.; Khalil, Diaa

doi:10.1117/12.2251099

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…These devices are usually used in conjunction with an optical cavity to increase sensitivity, i.e. cavity-enhanced sensing [7,[17][18][19]. An example of such a configuration is depicted in figure 1, where the optical power from the input fiber passes through an optical cavity consisting of three silicon/air Bragg mirrors to provide a high-finesse cavity, an optical cavity with high reflectivity mirrors, and the optical power is then coupled to the output fiber.…”

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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show abstract

“…This will translate to a very small cavity length which leads to high radiation loss and low-quality factor [18][19][20]. The use of a gain medium before the lasing threshold to enhance the quality factor has also been explored [21][22][23]. Yet, the gain medium introduces spontaneous emission noise and complexity into the whole system.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Q-factor and effective length silicon photonics filter utilizing nested ring resonators

Selim,

Anwar

2023

J. Opt.

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In this study, we investigate a novel design of an on-chip nested coupled ring resonator to enhance the quality factor and the effective length of the resonator. The configuration consists of an open ring and racetrack resonator, with lengths of 340 μm and 184.4 μm, respectively, with a coupling ratio of 97/3. In this regard, the proposed nested cavity has been experimentally characterized and compared with a single cavity ring resonator. Our results show a significant improvement in the quality factor by a factor of four. This improvement in performance opens up exciting new possibilities for state-of-the-art applications, such as compact optical sensors and delay lines. Our proposed design represents a significant advancement in the field of integrated optics, and we believe that it has the potential to enable a broad range of applications in the future.

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Silicon photonic coupled-ring resonator in nested configuration comprising different length scales

Shalaby

Adib

Sabry

et al. 2019

2019 14th International Conference on Computer Engineering and Systems (ICCES)

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Gain-assisted broadband ring cavity enhanced spectroscopy

Cited by 6 publications

References 15 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

Enhanced Q-factor and effective length silicon photonics filter utilizing nested ring resonators

Silicon photonic coupled-ring resonator in nested configuration comprising different length scales

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