Optimization of the Local Evanescent Array-Coupled Optoelectronic Sensing Chip for Enhanced, Portable, Real-Time Sensing

Erickson, Timothy A.; Lear, K.L.

doi:10.1109/jsen.2013.2242058

Cited by 3 publications

(2 citation statements)

References 38 publications

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“…The data presented in Table 1 highlights a noteworthy observation: with a lower cladding thickness of 1.5 µm, a smaller core waveguide thickness exhibited the highest sensitivity. This aligns seamlessly with previous research findings [1], reinforcing the notion that a smaller waveguide thickness tends to yield greater sensitivity, a trend consistently observed in prior experimental data. It's noteworthy that the absorption coefficient conforms to expectations, decreasing with an increase in the refractive index of the sensing region, a pattern corroborated by previous simulations.…”

Section: Core Waveguide and Cladding Thicknesssupporting

confidence: 91%

“…The Local Evanescent Array Coupled (LEAC) biosensor strategically utilizes the refractive index above the waveguide core to affect evanescent coupling to an underlying photodetector. Initial proof of concept studies fabricated and characterized sensors that operated at 660 𝑛𝑚 using a thick silicon detector [1]. To evaluate the potential to leverage volume manufacturing capabilities at silicon photonics foundries, the current study simulates LEAC biosensors operating at 1550 𝑛𝑚 using a germanium-on-silicon photodetector.…”

Section: Introductionmentioning

confidence: 99%

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Tolerance analysis of local evanescent array coupled (LEAC) sensors fabricated in silicon photonics foundries

Holmes,

Lear

2024

Physics and Simulation of Optoelectronic Devices XXXII

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Utilizing Beam Propagation Method (BPM) simulations, this study examines the layer thickness tolerances of Local Evanescent Array Coupled (LEAC) biosensors to be fabricated in silicon photonics foundries using conventional processes targeting 1.55 µm devices. The simulations reveal that sensitivity increases with lower cladding thickness while decreasing with core thickness. Additionally, the study investigates the biosensor's response to bulk and thin biofilm layers, offering nuanced insights with practical implications, especially for nanoscale-bound biological samples.In contrast to earlier fabrication and characterization work on LEAC sensors employing thick silicon detectors at visible wavelengths, simulations conducted at the long wavelength process with germanium photodetectors show an intriguing resonance phenomenon between the core waveguide and photodetector. This resonance allows for higher absorption and thus shorter sensor length but also requires excessively tight tolerances on detector thickness. To address this challenge, structures have been explored to shift the resonance, enhancing tolerance to variations in germanium photodiode layer thickness.

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Section: Core Waveguide and Cladding Thicknesssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%