AI Article Synopsis
- Nonlinear optical nanoscale waveguides enable effective wavelength conversion, making them useful in microscopy for delivering light while minimizing biological tissue damage.
- A novel high-precision fabrication method for these waveguides uses lithium niobate, known for its strong nonlinearity and wide transparency range.
- The developed waveguides, measuring 5 to 50 μm in length and 50 to 1000 nm in width, were successfully tested, demonstrating effective second-harmonic generation.
Article Abstract
Nonlinear optical nanoscale waveguides are a compact and powerful platform for efficient wavelength conversion. The free-standing waveguide geometry opens a range of applications in microscopy for local delivery of light, where in situ wavelength conversion helps to overcome various wavelength-dependent issues, such as biological tissue damage. In this paper, we present an original patterning method for high-precision fabrication of free-standing nanoscale waveguides based on lithium niobate, a material with a strong second-order nonlinearity and a broad transparency window covering the visible and mid-infrared wavelength ranges. The fabrication process combines electron-beam lithography with ion-beam enhanced etching and produces nanowaveguides with lengths from 5 to 50 μm, widths from 50 to 1000 nm and heights from 50 to 500 nm, each with a precision of few nanometers. The fabricated nanowaveguides are tested in an optical characterization experiment showing efficient second-harmonic generation.
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| http://dx.doi.org/10.1088/0957-4484/27/6/065301 | DOI Listing |
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