Solution-processible nanocrystals are attracting a lot of attention as versatile active media to create a wide range of optoelectronics, including sensors, light-emitting diodes, and lasers. Continuous wave on-chip nanolaser is a necessity building block for photonic integrated circuits. However, there is no solution-processed continuous nanolaser yet. In this work, we demonstrate a tunable silicon nanobeam laser integrated with solution processed PbS quantum dots operating at room temperature and optical telecommunication window.
Antireflective nanostructured surfaces (ARSS) enhance optical transmission through suppression of Fresnel reflection at boundaries between layered media. Previous studies show that random ARSS (rARSS) exhibit broadband enhancement and polarization insensitivity in transmission when applied to flat optical windows. Zinc selenide windows with rARSS treatment were fully characterized (transmittance, reflectance, and angular scatter) in the midwave and long-wave infrared range (2 to 12 μm). Four morphologically different, random nanoroughness, antireflective surfaces were tested at: normal incidence transmission, at 15 deg angle of incidence, and 15 deg to 45 deg angle of reflection. The angular reflectance distribution resembles a diffuse dipole radiator due to the finite elongated beam cross section at the incidence surface. Scattering diagrams with main and side lobes are presented. Partially integrated scatter values were obtained, allowing the comparison of random antireflective boundary performance to optically flat surfaces. Comparing axial transmission and specular reflection with the scattered performance, an accurate determination of the redistribution of the incident energy is obtained. Measurements of the rARSS feature topology were determined from autocorrelation of the scanning electron microscope images of the nanoroughened substrates, to assess the structured surfaces’ feature scales. The results show differences in scattered intensity over the wavelength bands of interest, correlating with surface random feature populations.
Anti-reflective nanostructured surfaces (ARSS) enhance optical transmission through suppression of Fresnel reflection at boundaries between layered media. Previous studies show random ARSS (rARSS) exhibit broadband enhancement in transmission and polarization insensitivity compared to typical optical windows. ZnSe samples with rARSS treatment were characterized (transmittance, reflectance, and angular scatter) in the mid-wave and long-wave infrared (2 - 12 μm) using a spectrophotometer. Five different random nano-roughness antireflective surfaces were tested at: normal incidence transmission and 15° angle of incidence -15 to 45° angle of reflection. The angular reflectance distribution resembles a diffuse dipole radiator, due to a finite elongated beam cross-section at the incident surface. Scattering diagrams with main and side lobes are presented. Comparing specular transmission and reflection with the scattered performance, an accurate determination of the redistribution of incident energy is obtained. Measurements of rms surface roughness using a confocal microscope is presented alongside the scattering data, for assessment of structured surface feature size effects. The results show differences in the scattered intensity, over the wavelength bands of interest, depending on the random topology of the surface. The partial-integrated scatter values were obtained, allowing the comparison of random anti-reflective surfaces to optically flat surfaces.
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