Opto-Electronic Advances, Volume. 3, Issue 5, 190035-1(2020)
Omnidirectional iridescence via cylindrically-polarized femtosecond laser processing
Fig. 1. The experimental setup used for surface structuring.The laser fluence was tuned via the use of a
Fig. 2. LSFL periodicity dependence on the laser fluence (a), and the effective number of pulses (b), for linearly (squares) and radially (circles) polarized fs beams. Top-view SEM images of areas produced upon irradiation using linearly (c, d) and radially (e, f) polarized fs beams.The images shown in (c) and (e) correspond to non-uniform areas, whereas those in (d) and (f) to areas obtained using optimized irradiation conditions. The red arrows depict the electric field polarization state. The 2D-FFT patterns corresponding to each area are shown.
Fig. 3. Top-view SEM images of areas produced upon irradiation using linearly (a–c) and radially (d–f) polarized fs beams.The images shown in (b, c) and (e, f) are higher magnifications of the images (a, d) respectively. The areas in (a–c) were fabricated at
Fig. 4. (
Fig. 5. Schematic illustration of the structural colors observed the S1 (a) and the S2 (b) sample series respectively; 2D-FFT patterns corresponding to the S1 (c) and the S2 (e) sample series respectively. The corresponding intensity plots of the 2D-FFT patterns in four different directions (denoted as '1' to '4') are depicted in (d) and (f) respectively.Inset in (f) displays the periodicity values of LSFL structures for a series of four cross-sections taken in the Fourier image of the S2 surface.
Fig. 6. (
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Nikolaos Livakas, Evangelos Skoulas, Emmanuel Stratakis. Omnidirectional iridescence via cylindrically-polarized femtosecond laser processing[J]. Opto-Electronic Advances, 2020, 3(5): 190035-1
Category: Original Article
Received: Sep. 16, 2019
Accepted: Nov. 26, 2019
Published Online: Aug. 10, 2020
The Author Email: Stratakis Emmanuel (stratak@iesl.forth.gr)