Fig. 3 Wavelength and polarization tunable mirrorless lasing from the heliconical superstructure. Wavelength and polarization tunable mirrorless lasing.

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Presentation transcript:

Fig. 3 Wavelength and polarization tunable mirrorless lasing from the heliconical superstructure. Wavelength and polarization tunable mirrorless lasing from the heliconical superstructure. (A) Illustration of the experimental setup for the characterization of laser performance (see Materials and Methods). NDFs, neutral density filters; BS, beam splitter. Output emission to the sample normal was analyzed using a fiber-coupled spectrometer (FCS) by rotating the polarizer (P), where the residue pump beam was blocked by a spectral filter (SF; cutoff wavelength, <550 nm). A quarter wave plate (QWP) at the wavelength of 632 nm was used to convert the circularly polarized emission into linear polarization. (B) Laser emission spectra from the heliconical superstructures with right-handedness (upper part) and left-handedness (lower part) when the electric field was varied between 1.09 and 1.32 V/μm. The positive and negative emission intensities denote the laser emission with right-handedness and left-handedness of circular polarization, respectively. (C) R-CP and L-CP laser emission intensity as a function of the polarization angle in the polar coordinate system from the heliconical superstructure in the PSSvis state and PSSUV state, respectively, where the polar angle ω stands for the transmission angle of the polarizer and the radius r stands for the transmittance. Cong-long Yuan et al. Sci Adv 2019;5:eaax9501 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).