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(a) Cross-sectional view and (b) Top view scanning electron micrographs (SEMs) of fabricated photonic crystal Fano filter structure based on silicon-on-insulator (SOI) wafers, where , , and are air hole radius, lattice constant, and Si layer thickness, respectively; (c) Micrograph of flexible Fano filters based on transferred single crystalline Si nanomembrane (SiNM) on flexible PET substrates; (d) Transmission electron micrograph (TEM) of nanocrystal colloidal PbSe quantum dots (CQDs); (e) Top view SEM image of Fano filter filled with PbSe CQDs; and (f) Schematic of SiNM based Fano filters filled with CQDs on flexible substrates. Surface normal optical measurement is also shown for both transmission and reflection .
Measured transmission and reflection spectra for Fano filter without and with PbSe CQDs, with the inset shown schematically the experimental setup for the simultaneous transmission/reflection measurement of the Fano filter.
Experimental and simulated absorption characteristics for the Fano filter filled with CQDs. Shown in the inset is the spectra of CQD extinction coefficient, k.
(a) Three sets of CQDs with different absorption peak locations; (b) three different Fano filters with different resonance locations; and (c) absorption enhancement factors for these three sets of samples.
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