ACS Photonics
ACS Photonics
5 years ago

Plasmonically Enhanced Kerr Frequency Combs

Plasmonically Enhanced Kerr Frequency Combs
Eda Gungor, Vinh M. Diep, Rigoberto Castro-Beltrán, Soheil Soltani, Andrea M. Armani
Optical frequency combs are high repetition rate, broad spectral bandwidth coherent light sources. These devices have numerous applications in many fields, ranging from fundamental science to defense. Recently, low-threshold and small-footprint frequency combs have been demonstrated using ultrahigh quality factor (Q) whispering gallery mode resonant cavities. The majority of research in cavity-based combs has focused on optimizing the Q. An alternative strategy is to engineer the cavity material to enhance the underlying nonlinear process for comb generation. In this work, we demonstrate that gold nanorods coated with a nonlinear material reduce the comb generation threshold when decorated on the surface of the resonant cavities. The enhancement mechanism is explored with finite element method modeling and can be explained in terms of photonic–plasmonic mode hybridization. A comb span of ∼300 nm in the near-IR range is observed with incident intensity <2 GW cm–2. The required threshold for parametric oscillation directly scales with nanorod concentration and ranges from 148 μW to 1.5 mW, which is 15 times lower than uncoated silica devices with similar optical performance.

Publisher URL: http://dx.doi.org/10.1021/acsphotonics.7b00808

DOI: 10.1021/acsphotonics.7b00808

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.