Multimode nanobeam cavities for nonlinear optics: high quality resonances separated by an octave

Buckley, Sonia; Radulaski, Marina; Zhang, Jingyuan Linda; Petykiewicz, Jan; Biermann, K.; Vučković, Jelena

doi:10.1364/oe.22.026498

Cited by 39 publications

(32 citation statements)

References 53 publications

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“…Many applications flourish including optical switch and logic gate [2], tunable filters [3], gas sensing and single molecule detection [4,5], Fano resonance operations [6], optomechanics [7,8], nonlinear frequency conversion [9,10], etc. Recently, photonic crystal split-beam cavities attracted numerous interests from researchers that further reduce the cavity geometries and enable feasible mechanical motions resulting from a higher degree of freedom.…”

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confidence: 99%

Design of mechanically-tunable photonic crystal split-beam nanocavity

et al. 2015

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Photonic crystal split-beam nanocavities allow for ultra-sensitive optomechanical transductions but are degraded due to their relatively low optical quality factors. We have proposed and experimentally demonstrated a new type of one-dimensional photonic crystal split-beam nanocavity optimized for an ultra-high optical-quality factor. The design is based on the combination of the deterministic method and hill-climbing algorithm. The latter is the simplest and most straightforward method of the local search algorithm that provides the local maximum of the chosen quality factors. This split-beam nanocavity is made up of two mechanical uncoupled cantilever beams with Bragg mirrors patterned onto it and separated by a 75-nm air gap. Experimental results emphasize that the quality factor of the second-order TE mode can be as high as 1.99×10(4). Additionally, one beam of the device is actuated in the lateral direction with the aid of a NEMS actuator, and the quality factor maintains quite well even if there is a lateral offset up to 64 nm. Potentially promising applications, such as sensitive optomechanical torque sensor, local tuning of Fano resonance, all-optical-reconfigurable filters, etc., are foreseen.

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confidence: 99%

Design of mechanically-tunable photonic crystal split-beam nanocavity

et al. 2015

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“…Since this device mediates an interaction between two different frequencies, one needs to ensure phase matching between the modes at both frequencies [15]. In a cavity structure, this equates to a non-zero spatial overlap between the cavity modes at the fundamental and the second harmonic frequencies [16,17]. However, as we show below, in the bistable device, both input and output light are at the fundamental mode frequency, while the second harmonic mode just mediates the nonlinear interaction.…”

Section: Theoretical Modelmentioning

confidence: 99%

Cavity enhanced nonlinear optics for few photon optical bistability

2015

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Weak material nonlinearity at optical frequencies poses a serious hurdle to realizing optical bistability at low optical powers, which is a critical component for digital optical computing. In this paper, we explore the cavity enhancement of the second-order optical nonlinearity in order to determine the feasibility of few photon optical bistability. Starting from a quantum optical formalism of a doubly resonant cavity (required to meet the condition of phase matching), we derive a dynamic classical model of a cavity that is bistable at the fundamental mode. We analyze the optical energy and the switching speed as a function of the cavity quality factors and mode volumes and identify the regime where only ten's of photons are required to perform the switching. An unusual trend in the switching speed is also observed, where the speed monotonically decreases as the cavity linewidth increases. This is ascribed to the increase in the switching gain with increasing cavity linewidth.

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“…Optical cavities showing high quality factors are essential building blocks for many applications such as nonlinear optics [1], refractive index sensing [2], enhanced emission [3] and filters [4] to mention a few. In twodimensional photonic crystals (2D-PhCs), light confinement is achieved by taking advantage of both photonic bandgaps (in the plane) and total internal reflection (perpendicular direction), respectively.…”

Section: Introductionmentioning

confidence: 99%

Control of Q-factor in nanobeam cavities on substrate

O’Faoláin

Grande

2016

2016 18th International Conference on Transparent Optical Networks (ICTON)

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In this paper, we demonstrate how to efficiently control the quality factor of silicon nitride nanobeam cavities, grown on a silica substrate and embedded in an upper cladding, by engineering the nanobeam cross-section and the shape of the periodic holes. We propose optimized configurations that are able to overcome the decreasing of the Q-factor when the nanobeam is embedded in an asymmetric medium. More precisely, we show that the maximum achievable quality factor can be designed and tuned in asymmetric configurations where the upper cladding is particularly different from the substrate one. These optimized configurations exhibit high-Q factor and small mode volume over a wide range of the upper cladding refractive index paving the way for the realization of innovative optical sensors and for the compensation of fabrication tolerances in embedded optical nanobeam cavities.

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Multimode nanobeam cavities for nonlinear optics: high quality resonances separated by an octave

Cited by 39 publications

References 53 publications

Design of mechanically-tunable photonic crystal split-beam nanocavity

Design of mechanically-tunable photonic crystal split-beam nanocavity

Cavity enhanced nonlinear optics for few photon optical bistability

Control of Q-factor in nanobeam cavities on substrate

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