Analysis of light propagation in slotted resonator based systems via coupled-mode theory

Hiremath, Kirankumar R.; Niegemann, Jens; Busch, Kurt

doi:10.1364/oe.19.008641

Cited by 12 publications

(4 citation statements)

References 25 publications

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“…A ring resonator can be understood as the combination of a directional coupler and a feedback loop. − First, the directional coupler is modeled by the input–output relations ( centertrue s 1 s 2 ) = ( centertrue t k − k * t * ) ( lefttrue a 1 a 2 ) where k and t are the coupling and transmission coefficients, respectively. Both parameters are related by false| t false| 2 + false| k false| 2 = 1 for a lossless directional coupler.…”

Section: Resultsmentioning

confidence: 99%

Noise Cancellation Effects in Integrated Photonics with Wilkinson Power Dividers

Ortega‐Gomez¹,

Hernández²,

Oña³

et al. 2023

ACS Photonics

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Wilkinson power dividers (WPDs) are a popular element in RF and microwave technologies known for providing isolation capabilities. However, the benefits that WPDs could offer to integrated photonic systems are far less studied. Here, we investigate the thermal emission from and the noise performance of silicon-on-insulator (SOI) WPDs. We find that WPDs exhibit a noiseless port, with important implications for receiving systems and absorption-based quantum state transformations. At the same time, the thermal signals exiting noisy ports exhibit nontrivial correlations, opening the possibility for noise cancellation. We analyze passive and active networks containing WPDs showing how such nontrivial correlations can prevent the amplification of the thermal noise introduced by WPDs while benefiting from their isolation capabilities. Using this insight, we propose a modified ring-resonator amplifier that improves by N times the SNR in comparison with conventional traveling wave and ring-resonator amplifiers, with N being the number of inputs/outputs of the WPD. We believe that our results represent an important step forward in the implementation of SOI-WPDs and their integration in complex photonic networks, particularly for mid-IR and quantum photonics applications.

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Section: Resultsmentioning

confidence: 99%

Noise Cancellation Effects in Integrated Photonics with Wilkinson Power Dividers

Ortega‐Gomez¹,

Hernández²,

Oña³

et al. 2023

ACS Photonics

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“…Over the past decades, microring resonators have been widely used in many fields due to their simple manufacturing process, excellent performance, flexible design, and small volume. In order to further enhance the interaction between optical fields and environmental mediums [1][2][3][4][5][6][7], nanoslot structures were introduced into the microring resonators, providing strong light confinements and localized field enhancements [8][9][10][11]. Recently, photonic crystal (PC) microring resonators have attracted great attentions for their ultracompact footprint, high Q-factor and small mode volume [12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Nanoslotted microring resonator for high figure of merit refractive index sensing

Yang¹,

Duan²,

Zhang³

et al. 2020

Optica Applicata

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A nanoslotted microring resonator (NSMR) with enhanced light-matter interaction has been designed, which can be used for high sensitive refractive index sensing. The performance of the device is investigated theoretically based on a three-dimensional finite-difference time-domain (3D-FDTD) method. In order to achieve high figure of merit sensing, the nanoslot geometry is exploited to make the optical field strongly localized inside the low index region and overlap sufficiently with the analytes. By using the 3D-FDTD method, the proposed NSMR sensor device achieves a high Q-factor (Q > 105) and sensitivity ~100 nm/RIU (RIU – refractive index unit). Moreover, the strong light confinement introduced by the nanoslot in NSMR results in the sensor figure of merit as high as 6.73 × 103. Thus, the design we proposed is a promising platform for refractive index-based biochemical sensing and lab-on-a-chip applications.

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“…It has been observed that narrow slot/slots in the waveguides further enhance the confinement of particular optical modes in the core region and reduce the bending loss of the waveguide [13]. Straight and bent waveguides with slotted cross-sectional regions can be combined to build microring resonators which have wide range of applications in integrated optics [14]. Slotted waveguides are particularly interesting in nonlinear optics due to their very small effective mode area and flat dispersion profiles [15,16].…”

Section: Introductionmentioning

confidence: 99%

On-chip broadband ultra-compact optical couplers and polarization splitters based on off-centered and non-symmetric slotted Si-wire waveguides

Haldar

Mishra

Dutt

et al. 2016

J. Opt.

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In this work, we propose novel schemes to design on-chip ultra-compact optical directional couplers (DC) and broadband polarization beam splitters (PBS) based on off-centered and asymmetric dielectric slot waveguides, respectively. Slot dimensions and positions are optimized to achieve maximum coupling coefficients between two symmetric and non-symmetric slotted Si wire waveguides through overlap integral method. We observe >88% of enhancement in the coupling coefficients when the size-optimized slots are placed in optimal positions, with respect to the same waveguides with no slot. When the waveguides are parallel, in that case, a coupling length as short as 1.73 μm is accomplished for TM mode with the off-centered and optimized slots. This scheme enables us to design optical DC with very small footprint, Lc ∼ 0.9 μm in the presence of S-bends. We also report a compact (Lc ∼ 1.1 μm) on-chip broadband PBS with hybrid slots. Extinction ratios of 13 dB and 22.3 dB are realized with very low insertion loss (0.055 dB and 0.008 dB) for TM and TE modes at 1.55 μm, respectively. The designed PBS exhibits a bandwidth of 78 nm for the TM mode (C-and partial L-bands) and >100 nm for the TE mode (S + C + L wavelength bands). Such on-chip devices can be used to design compact photonic interconnects and quantum information processing units efficiently. We have also investigated the fabrication tolerances of the proposed devices and described the fabrication steps to realize such hybrid devices. Our results are in good agreement with 3D FDTD simulations.

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Analysis of light propagation in slotted resonator based systems via coupled-mode theory

Cited by 12 publications

References 25 publications

Noise Cancellation Effects in Integrated Photonics with Wilkinson Power Dividers

Noise Cancellation Effects in Integrated Photonics with Wilkinson Power Dividers

Nanoslotted microring resonator for high figure of merit refractive index sensing

On-chip broadband ultra-compact optical couplers and polarization splitters based on off-centered and non-symmetric slotted Si-wire waveguides

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