Broadband nanophotonic waveguides and resonators based on epitaxial GaN thin films

Bruch, Alexander; Xiong, Chi; Leung, Benjamin; Poot, Menno; Han, Jung; Tang, Hong X.

doi:10.1063/1.4933093

Cited by 49 publications

(33 citation statements)

References 34 publications

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“…For this geometry, the azimuthal mode of order g = 21 is found at a frequency of 393.58 THz, with a moderate Q ≈ 20, 000, well within the range of what can be realistically fabricated. 29 We calculate the vectorial components of this mode using a finite-element eigenmode solver (Comsol Multiphysics), showing the resultant intensity distribution in the inset of Fig. 1.…”

Section: Resonant Chiral Emissionmentioning

confidence: 99%

Chiral Emission into Nanophotonic Resonators

2019

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Chiral emission, where the handedness of a transition dipole determines the direction in which a photon is emitted, has recently been observed from atoms and quantum dots coupled to nanophotonic waveguides. Here, we consider the case of chiral light-matter interactions in resonant nanophotonic structures, deriving closed-form expressions for the fundamental quantum electrodynamic quantities that describe these interactions. We show how parameters such as the position dependent, directional Purcell factors and mode volume can be calculated using computationally efficient two dimensional eigenmode simulations. As an example, we calculate these quantities for a prototypical ring resonator with a geometric footprint of only 4.5 µm 2 , showing that perfect directionality with a simultaneous Purcell enhancement upwards of 400 are possible. The ability to determine these fundamental properties of nanophotonic chiral interfaces is crucial if they are to form elements of quantum circuits and networks.

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Section: Resonant Chiral Emissionmentioning

confidence: 99%

Chiral Emission into Nanophotonic Resonators

2019

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“…GaN films are drawing increasing attention [8][9][10][11][12][13][14]. In particular, the absence of twophoton and even three-photon absorption at telecommunication wavelengths holds much promise for the use of GaN waveguides in all-optical nonlinear signal processing applications.…”

Section: Motivated By the Above Advantages Waveguides And Light-guidmentioning

confidence: 99%

Four-wave mixing and nonlinear parameter measurement in a gallium-nitride ridge waveguide

Munk

Katzman

Westreich

et al. 2017

Opt. Mater. Express

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Gallium-nitride (GaN) is a promising material platform for integrated electro-optic devices due to its wide direct bandgap, pronounced nonlinearities and high optical damage threshold. Low-loss ridge waveguides in GaN layers were recently demonstrated. In this work we provide a first report of four-wave mixing in a GaN waveguide at telecommunication wavelengths, and observe comparatively high nonlinear propagation parameters. The nonlinear coefficient of the waveguide is measured as 1.6±0.45 [Wm] -1 , and the corresponding third-order nonlinear parameter of GaN is estimated as 3.4±1e-18 [m 2 /W]. The results suggest that GaN waveguides could be instrumental in nonlinear-optical signal processing applications.

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“…A comparison with those of the optimized cavity concludes that Q m , g 0 /2π, and f m · Q m decrease slightly while Q o is more sensitive to fabrication errors due to the increased reflection loss from the OMC mirrors. A recent paper62 reports an experimentally demonstrated Q o of 55,000 at the wavelength of 788.35 nm in GaN ring resonators with the absorption coefficient ( α ) of ~60 cm −1 (ref. 63).…”

Section: Discussionmentioning

confidence: 99%

Ultraviolet optomechanical crystal cavities with ultrasmall modal mass and high optomechanical coupling rate

Zhou

et al. 2016

Sci Rep

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Optomechanical crystal (OMC) cavities which exploit the simultaneous photonic and phononic bandgaps in periodic nanostructures have been utilized to colocalize, couple, and transduce optical and mechanical resonances for nonlinear interactions and precision measurements. The development of near-infrared OMC cavities has difficulty in maintaining a high optomechanical coupling rate when scaling to smaller mechanical modal mass because of the reduction of the spatial overlap between the optical and mechanical modes. Here, we explore OMC nanobeam cavities in gallium nitride operating at the ultraviolet wavelengths to overcome this problem. With a novel optimization strategy, we have successfully designed an OMC cavity, with a size of 3.83 × 0.17 × 0.13 μm3 and the mechanical modal mass of 22.83 fg, which possesses an optical mode resonating at the wavelength of 393.03 nm and the fundamental mechanical mode vibrating at 14.97 GHz. The radiation-limited optical Q factor, mechanical Q factor, and optomechanical coupling rate are 2.26 × 107, 1.30 × 104, and 1.26 MHz, respectively. Our design and optimization approach can also serve as the general guidelines for future development of OMC cavities with improved device performance.

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Broadband nanophotonic waveguides and resonators based on epitaxial GaN thin films

Cited by 49 publications

References 34 publications

Chiral Emission into Nanophotonic Resonators

Chiral Emission into Nanophotonic Resonators

Four-wave mixing and nonlinear parameter measurement in a gallium-nitride ridge waveguide

Ultraviolet optomechanical crystal cavities with ultrasmall modal mass and high optomechanical coupling rate

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