Accurate measurement of scattering and absorption loss in microphotonic devices

Borselli, Matthew; Johnson, Thomas J.; Painter, Oskar

doi:10.1364/ol.32.002954

Cited by 39 publications

(24 citation statements)

References 14 publications

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“…The asymmetry in the generated SH spectrum mirrors that of the transmission spectrum at the fundamental wavelength. This type of power-dependent lineshape distortion has been observed in other microphotonic devices293031 and is attributed to thermal and higher-order nonlinear effects. The lineshape distortion that limits conversion may be ameliorated by surface treatment31.…”

Section: Discussionsupporting

confidence: 66%

Second-harmonic generation using -quasi-phasematching in a GaAs whispering-gallery-mode microcavity

2014

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The crystal symmetry in materials such as GaAs can enable quasi-phasematching for efficient optical frequency conversion without poling, twinning or other engineered domain inversions. symmetry means that a 90° rotation is equivalent to a crystallographic inversion. Therefore, when light circulates about the axis, as in GaAs whispering-gallery-mode microdisks, it encounters effective domain inversions that can produce quasi-phasematching. Microdisk resonators also offer resonant field enhancement, resulting in highly efficient frequency conversion in micrometre-scale volumes. These devices can be integrated in photonic circuits as compact frequency convertors, sources of radiation or entangled photons. Here we present the first experimental observation of second-harmonic generation in a whispering-gallery-mode microcavity utilizing -quasi-phasematching. We use a tapered fibre to couple into the 5-μm diameter microdisk resonator, resulting in a normalized conversion efficiency η≈5 × 10−5 mW−1. Simulations indicate that when accounting for fibre-cavity scattering, the normalized conversion efficiency is η≈3 × 10−3 mW−1.

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Section: Discussionsupporting

confidence: 66%

Second-harmonic generation using -quasi-phasematching in a GaAs whispering-gallery-mode microcavity

2014

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“…This type of measurement indicates any non-linear optical absorption and can be used to determine the linear absorption of a material [73]. Non-linear absorption would result in a change in the extinction ratio with respect 5.…”

Section: B Surface Treatmentmentioning

confidence: 99%

Si<inline-formula><tex-math>$_{\bf 3}$</tex-math></inline-formula>N<inline-formula> <tex-math>$_{\bf 4}$</tex-math></inline-formula> Nanobeam Optomechanical Crystals

Grutter

Davanço

Srinivasan

2015

IEEE J. Select. Topics Quantum Electron.

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The development of Si 3 N 4 nanobeam optomechanical crystals is reviewed. These structures consist of a 350-nm thick, 700-nm wide doubly-clamped Si 3 N 4 nanobeam that is periodically patterned with an array of air holes to which a defect region is introduced. The periodic patterning simultaneously creates a photonic bandgap for 980 nm band photons and a phononic bandgap for 4 GHz phonons, with the defect region serving to colocalize optical and mechanical modes within their respective bandgaps. These optical and mechanical modes interact dispersively with a coupling rate g 0 /2π ≈ 100 kHz, which describes the shift in cavity mode optical frequency due to the zero-point motion of the mechanical mode. Optical sidebands generated by interaction with the mechanical mode lie outside of the optical cavity linewidth, enabling possible use of this system in applications requiring sideband-resolved operation. Along with a review of the basic device design, fabrication, and measurement procedures, we present new results on improved optical quality factors (up to 4 × 10 5 ) through optimized lithography, measurements of devices after HF acid surface treatment, and temperature dependent measurements of mechanical damping between 6 and 300 K. A frequency-mechanical quality factor product (f × Q m ) as high as ≈ 2.6 × 10 13 Hz is measured.

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“…Also relevant would be to extend the above characterization by quantifying the separate contributions to the total measured loss due to scattering and linear absorption. A convenient technique for doing so has been presented by Borselli, et al 15 Chip ID# Propagation loss Coupling loss…”

Section: Device Characterizationmentioning

confidence: 99%

Towards an integrated squeezed light source

et al. 2017

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Abstract. Since it's first generation more than 30 years ago, squeezed light has developed towards a tool for high precision measurements as well as a tool for quantum information tasks like quantum key distribution. Miniaturization of sensors is an active field of research with the prospect of many applications. The precision of optical sensors based on interferometric measurements is often limited by the fundamental shot noise. While shot noise can be reduced by increasing the employed light power, integrated sensors pose limitations on the maximum possible amount due to damaging effects of high intensity as well as power consumption. Bright quadrature squeezed light produced by the optical Kerr effect in a nonlinear medium offers an opportunity to overcome these limitations. Here, we present first steps towards a bright quadrature squeezed light source produced by the optical Kerr effect in race-track resonators in silicon nitride by presenting characterizations of the chip. Using standard fabrication techniques this source will have the potential of seamless integration into on-chip optical sensors.

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Accurate measurement of scattering and absorption loss in microphotonic devices

Cited by 39 publications

References 14 publications

Second-harmonic generation using -quasi-phasematching in a GaAs whispering-gallery-mode microcavity

Second-harmonic generation using -quasi-phasematching in a GaAs whispering-gallery-mode microcavity

Si<inline-formula><tex-math>$_{\bf 3}$</tex-math></inline-formula>N<inline-formula> <tex-math>$_{\bf 4}$</tex-math></inline-formula> Nanobeam Optomechanical Crystals

Towards an integrated squeezed light source

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