Cavity-enhanced second-harmonic generation via nonlinear-overlap optimization
By Zin Lin, Xiangdong Liang, Marko Loncar, Steven G. Johnson, Alejandro W. Rodriguez. 2015
156 citations recorded by the source corpus.
We describe a novel approach based on topology optimization that enables automatic discovery of wavelength-scale photonic structures for achieving high-efficiency second-harmonic generation (SHG). A key distinction from previous formulation and designs that seek to maximize Purcell factors at individual frequencies is that our method aims to not only achieve frequency matching (across an entire octave) and large radiative lifetimes, but also optimizes the equally important nonlinear-coupling figure of merit β¯, involving a complicated spatial overlap-integral between modes. We apply this method to the particular problem of optimizing micropost and grating-slab cavities (one-dimensional multilayered structures) and demonstrate that a variety of material platforms can support modes with the requisite frequencies, large lifetimes Q>104, small modal volumes ∼(λ/n)3, and extremely large β¯≳10−2, leading to orders of magnitude enhancements in SHG efficiency compared to state-of-the-art photonic designs. Such giant β¯ alleviate the need for ultranarrow linewidths and thus pave the way for wavelength-scale SHG devices with faster operating timescales and higher tolerance to fabrication imperfections.
Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering, Surfaces, Coatings and Films
View Paper: https://www.semanticscholar.org/paper/062e5416c94e6e0c9b2f6530fe5eb063c0878647
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Atomic and Molecular Physics, and Optics
In Electrical and Electronic Engineering
In Surfaces, Coatings and Films
Citations in the corpus
- Adjoint Method and Inverse Design for Nonlinear Nanophotonic Devices (2018, background): “25 To this end, several recent works 26 − 28 have applied adjoint methods to engineer linear devices to display favorable properties for nonlinear optical applications, such as high quality factors, small mode volume, or large fi eld overlap between the modes of interest.”