Robust optimization of adiabatic tapers for coupling to slow-light photonic-crystal waveguides | Zendy

Ardavan Oskooi | Zendy; Almir Mutapcic | Zendy; Susumu Noda | Zendy; John D. Joannopoulos | Zendy; Stephen Boyd | Zendy; Steven G. Johnson | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

Robust optimization of adiabatic tapers for coupling to slow-light photonic-crystal waveguides

Author(s) -

Ardavan Oskooi,

Almir Mutapcic,

Susumu Noda,

John D. Joannopoulos,

Stephen Boyd,

Steven G. Johnson

Publication year - 2012

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.20.021558

Subject(s) - optics , photonic crystal , group velocity , coupling (piping) , scaling , perfectly matched layer , slow light , length scale , adiabatic process , physics , materials science , finite difference time domain method , mathematics , geometry , metallurgy , thermodynamics , quantum mechanics

We investigate the design of taper structures for coupling to slow-light modes of various photonic-crystal waveguides while taking into account parameter uncertainties inherent in practical fabrication. Our short-length (11 periods) robust tapers designed for ? = 1.55?m and a slow-light group velocity of c/34 have a total loss of < 20 dB even in the presence of nanometer-scale surface roughness, which outperform the corresponding non-robust designs by an order of magnitude. We discover a posteriori that the robust designs have smooth profiles that can be parameterized by a few-term (intrinsically smooth) sine series which helps the optimization to further boost the performance slightly. We ground these numerical results in an analytical foundation by deriving the scaling relationships between taper length, taper smoothness, and group velocity with the help of an exact equivalence with Fourier analysis.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research