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IR-140 ASE (dotted line) and imprinted DFB laser emission (solid line) spectra at excitation fluence above the lasing threshold. Top inset: AFM topographic view of the patterned dye-doped PMMA grating . Bottom inset: molecular structure of IR-140.
DFB peak emission intensity vs fluence of the absorbed excitation beam. The solid line is a linear fit to the input-output characteristics above the lasing theshold. Inset: device tunability. Peaks at (A) and (C) were obtained from structures with a grating period of 580 and , respectively.
Polarized PL spectra: polarization components parallel (dashed line) and perpendicular (continuous line) to the grating lines. Inset: dependence of the output intensity on the angle between the polarizer axis and the grating grooves; the solid line is a fit to the data by the Malus law.
Temporal evolution of the laser emission when exposed in air (full circles) or vacuum (empty circles) conditions (excitation fluence of ). The solid lines are a fit to the experimental data with an exponential function. Inset: wavelength of the DFB laser peak vs exposure time.
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