Taming the Electromagnetic Boundaries via Metasurfaces: From Theory and Fabrication to Functional Devices
(a) Schematic of the small-divergence laser, which comprises a QCL and a metallic slit-grating structure defined on its facet. (b, c) Cross sections of the two device designs. (d) 2D simulation of the intensity distribution of a small-divergence QCL of the second design lasing at μm. (e) Calculated far-field intensity distribution of the device shown in (d); inset: enlarged view of the central lobe. (f) Measured 2D far-field intensity of device B patterned with the slit-grating structure. Figures are reproduced from .
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