Silicon-on-sapphire ring resonators operate at a 5.5 μm wavelength

Researchers at the University of Washington (Seattle, WA) and Cornell University (Ithaca, NY) have created the first silicon-waveguide ring resonators for wavelengths between 5.4 and 5.6 μm, opening up a new region for ring-resonator applications such as biosensing and modulation. The resonators, as well as ridge waveguides, were fabricated on a silicon-on-sapphire (SOS) substrate.

The chip was patterned using electron-beam lithography and contained various ridge waveguides and ring resonators. Waveguides with a height of 0.6 μm and varying widths were fabricated; as predicted, a 1.8 μm wide waveguide properly channeled the fundamental mode of linearly polarized light at a 5.5 μm wavelength. The measured loss of the ridge waveguide was 4.0 ± 0.7 dB/cm at laser powers ranging from 6 to 100 mW (with an insertion loss of 25 dB), indicating minimal nonlinear loss. The ring resonators had various radii and edge-to-edge spacings; a sample ring had a 40 μm radius and a 0.25 μm edge-to-edge spacing, and exhibited a cavity Q factor of 3000, a free spectral range of 29.7 nm, and an associated group index of 3.99. Optimizing the drop port should boost the Q closer to its theoretical value of 25,000. Contact Alexander Spott at aspott@uwashington.edu.

 


More Laser Focus World Current Issue Articles


More Laser Focus World Archives Issue Articles


Most Popular Articles

Webcasts

Handheld Spectrometers

Spectroscopy can be a powerful measurement tool, and handheld spectrometers offer the ultimate in portability, so the instrument can be applied wherever meas...

Fracking, climate change, and lasers:  new tools to reduce fugitive methane emissions

This webcast, sponsored by Hamamatsu Corporation, covers recent developments and field deployments of compact quantum-cascade-laser (QCL)-based methane senso...

Opportunities in the Mid-IR

The technology for exploiting the mid-IR is developing rapidly:  it includes quantum-cascade lasers and other sources, spectroscopic instruments of many...

Fiber Optic Sensors – Fundamentals, Principles and Applications

In this webcast, sponsored by Nufern, we focus on optical fiber sensing technology.  Fundamental concepts will be presented first, followed by the under...
Technical Digests

Keeping pace with developments in Raman spectroscopy for molecular and nanoparticle research

For demanding or custom spectroscopy solutions, care must be taken in selecting and integrating a...
Sponsored by

HIGH-POWER FIBER LASERS: Working in the kilowatt regime

High-power materials-processing fiber lasers are available in an increasing variety of forms, as ...
Sponsored by

Click here to have your products listed in the Laser Focus World Buyers Guide.

RELATED PRODUCTS

Laser Beamsteering Mirrors

First choice for all mirror applications: Optics Balzers designs and produces flat mirr...

Fluorescence Filter Sets

Optics Balzers fluorescence filter sets include excitation and emission filters (bandpa...

Westech Optical Mirrors

Westech provides stock and custom mirrors. Spherical and flat mirrors are the most popu...

RELATED COMPANIES

Technodiamant USA Inc

Manufactures quality diamond tools including "Controlled Waviness" tools for precision ...

CVI Laser Optics

Provides solutions for semiconductor, biotechnology, materials processing and basic res...

Cirrus Photonics LLC

Provides innovative light source and optical systems solutions to address demanding tec...

Social Activity

  •  
  •  
  •  
  •  
  •  
Copyright © 2007-2014. PennWell Corporation, Tulsa, OK. All Rights Reserved.PRIVACY POLICY | TERMS AND CONDITIONS