Resonant grating–waveguide structures for visible and near-infrared radiation

Sharon, André; Rosenblatt, D.; Friesem, Asher A.

doi:10.1364/josaa.14.002985

Cited by 145 publications

(89 citation statements)

References 17 publications

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“…In this setup, higher diffraction orders experience total internal reflection (at the boundary layer to the low-index substrate) and excite resonant waveguide modes. If p, the groove depth d, the grating duty cycle f (ratio between grating ridge b and period p), and the highindex layer thickness with respect to the refractive index values of the involved materials are designed properly, all transmitted light can be prompted to interfere destructively [14]. It has been shown previously that this is even possible with zero waveguide layer thickness, see Fig.…”

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confidence: 95%

“…They build on resonant waveguide gratings that comprise a periodically microstructured highindex layer attached to a low-index substrate [12][13][14][15]. Though this approach reduces the thick dielectric layer stack of conventional mirrors to a thin waveguide layer, at least one residual coating step is involved for the fabrication of such elements, thus causing a reduction of the mechanical quality.…”

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confidence: 99%

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Monolithic dielectric surfaces as new low-loss light-matter interfaces

et al. 2008

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We propose a new mirror architecture, which is solely based upon structuring of the surface of a monolithic, possibly monocrystalline, bulk material. We found that a structure of T-shaped ridges of a subwavelength grating can theoretically provide 100% reflectivity. Since no material needs to be added to the mirror device, lowest mechanical loss can also be expected. [5,6] this interface needs to provide outstanding low optical and mechanical losses. High reflectivity is demanded as lost photons result in decoherence of the light-matter quantum state. High mechanical quality factors of the test mass vibrational modes are required to reduce the influence of thermal noise [7] and to reach the quantum mechanical ground state [8]. In current approaches the surface of the mechanical device is composed of a multilayer dielectric coating. Reflectivities of up to 99.9998% have been demonstrated [9]. To achieve high mechanical quality factors, monocrystalline materials such as quartz or silicon are used. Quality factors above 10 9 were measured [10]. However, recent theoretical and experimental research revealed that multilayer dielectric coatings result in a significant reduction of quality factors [7], and that the simultaneous realization of high optical and mechanical quality is a nontrivial problem.

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confidence: 95%

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confidence: 99%

Monolithic dielectric surfaces as new low-loss light-matter interfaces

et al. 2008

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“…However, in these cases thermo-refractive noise resulting from a temperature-dependent refractive index and also thermal lensing are increased due to the large optical path length inside the substrate material. Surface relief guided-mode resonant waveguide structures [15,16,17] provide an alternative approach for reaching high reflectivity and simultaneously ensure low mechanical loss. Here, the coating thermal noise is reduced due to the fact that the (high-mechanical quality) substrate carries only a single, thin but corrugated high refractive index layer [18].…”

Section: Introductionmentioning

confidence: 99%

Demonstration of a cavity coupler based on a resonant waveguide grating

Brückner¹,

Friedrich²,

Clausnitzer³

et al. 2008

Opt. Express

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Abstract:Thermal noise in multilayer optical coatings may not only limit the sensitivity of future gravitational wave detectors in their most sensitive frequency band but is also a major impediment for experiments that aim to reach the standard quantum limit or to cool mechanical systems to their quantum ground state. Here, we present the experimental realization and characterization of a cavity coupler, which is based on a surface relief guided-mode resonant grating. Since the required thickness of the dielectric coating is dramatically decreased compared to conventional mirrors, it is expected to provide low mechanical loss and, thus, low thermal noise. The cavity coupler was incorporated into a Fabry-Perot resonator together with a conventional high quality mirror. The finesse of this cavity was measured to be F = 657, which corresponds to a coupler reflectivity of R = 99.08 %.

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“…Diffraction of a monochromatic plane wave by a surface-corrugated waveguide and by a substrate-corrugated waveguide was studied by Golubenko et al (1985). A multiple interference model related to an intuitive ray picture and a second-order perturbation approach with a Green's function formulation were developed for thin dielectric waveguides by Sharon et al (1997).…”

Section: Introductionmentioning

confidence: 99%

Leaky-mode resonant gratings on a fibre facet

2018

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Numerical investigation shows that an optimised leaky-mode resonant diffraction gratings fabricated in Ta 2 O 5 layer deposited on the facet of an optical fibre can have a modal reflectance peak of more than 95%, 3 dB spectral bandwidth of about 50 nm and polarization extinction ratio of almost 18 dB. The grating is intended to be employed as a high-reflectance, wavelength-and polarization-dependent mirror in a fibre laser. We compare results of 2D and 3D modelling, investigate influence of grating parameters on spectral shape of modal reflectance and discuss fabrication tolerances.

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Resonant grating–waveguide structures for visible and near-infrared radiation

Cited by 145 publications

References 17 publications

Monolithic dielectric surfaces as new low-loss light-matter interfaces

Monolithic dielectric surfaces as new low-loss light-matter interfaces

Demonstration of a cavity coupler based on a resonant waveguide grating

Leaky-mode resonant gratings on a fibre facet

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