Flat dielectric grating reflectors with focusing abilities

By David Fattal, Jingjing Li, Z. Peng, Marco Fiorentino, Raymond G. Beausoleil. 2010

517 citations recorded by the source corpus.

Sub-wavelength dielectric gratings have emerged recently as a promising alternative to distributed Bragg reflection dielectric stacks for broadband, high-reflectivity filtering applications. Such a grating structure composed of a single dielectric layer with the appropriate patterning can sometimes perform as well as 30 or 40 dielectric distributed Bragg reflection layers, while providing new functionalities such as polarization control and near-field amplification. In this Letter, we introduce an interesting property of grating mirrors that cannot be realized by their distributed Bragg reflection counterpart: we show that a non-periodic patterning of the grating surface can give full control over the phase front of reflected light while maintaining a high reflectivity. This new feature of dielectric gratings allows the creation of miniature planar focusing elements that could have a substantial impact on a number of applications that depend on low-cost, compact optical components, from laser cavities to CD/DVD read/write heads.

Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Surfaces, Coatings and Films

View Paper: https://www.semanticscholar.org/paper/3ecf57a5ade5be309ac04ea6711635e74be564f1

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In Biomedical Engineering

In Electrical and Electronic Engineering

In Surfaces, Coatings and Films

Citations in the corpus

Sub-Wavelength Grating Lenses With a Twist (2014, background): “In cylindrical coordinates the phase function for a vortex lens of focal length f and order is ϕl (r, θ) = 2π λ ( f − √ f 2 + x2 + y2 ) + lθ (2) This type of lens adds units of OAM to every transmitted photon, generating chiral light that is used today for various applications from quantum informati”
Light Propagation with Phase Discontinuities: Generalized Laws of Reflection and Refraction (2011, background): “The choice of the resonators is potentially wide-ranging, from electromagnetic cavities (9, 10) to nanoparticle clusters (11, 12) and plasmonic antennas (13, 14).”