Abstract
We demonstrate the operation of a flexible optical filter based on guided mode resonances that operates in the visible regime. The filter is fabricated on a free standing polymeric membrane of 1.3 μm thickness and we show how the geometrical design parameters of the filter determine its optical properties, and how various types of filter can be made with this scheme. To highlight the versatility and robustness of the approach, we mount a filter onto a collimated fibre output and demonstrate successful wavelength filtering.
Highlights
Guided mode resonance (GMR) filters were proposed in the 1990s [1,2] as a novel way for providing a narrow linewidth wavelength response
GMRs were based on high contrast dielectrics, but the same scheme can be implemented in metals, allowing the realization of extraordinary transmission effects [9] and perfect absorption [10]
We developed for 45 seconds in ethyl lactate (EC) solvent and reactive ion etched for 8 mins at a pressure of 5 × 10−2 Pa
Summary
Guided mode resonance (GMR) filters were proposed in the 1990s [1,2] as a novel way for providing a narrow linewidth wavelength response. Ated with high losses, limiting their use for producing narrow linewidth filters This is because the linewidth (inversely proportional to the quality factor Q) of a plasmonic resonance is set by the material properties [11], and is generally low. Flexible plasmonic structures for the optical regime have recently been demonstrated [19] and the advantage of flexibility includes the possibility of tuning the resonances after fabrication [20, 21], and placing the filter onto curved substrates. This proposed optical device belongs to the class of metasurfaces, being an extension of frequency selective surfaces [22].
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