In this paper a two-dimensional (2D) active nanograting photonic crystal (PC) which consists of air rods with a gammadion shape in a nanocomposite prepared by incorporating CdSe/CdS core/shell nanorods (NR) in a polymer is proposed and experimentally demonstrated. Scanning electron microscopy and spectra measurements are used to characterize the experimental structure. The vertical extraction of the light, by the coupling of the modes guided by the PQC slab to the free radiation via Bragg scattering, consists of a very narrow orange emission band at 610 nm with a full width at half-maximum (FWHM) of 14 nm. In this work the integration of CdSe/CdS core/shell nanorods in planar gammadion nanogratings is proposed as a new method to develop active devices based on organic photonics. The active nanocomposite containing colloidal semiconductor quantum rods of nanometer size scale is patterned to fabricate a 2D active PC. The 2D-PC pattern with gammadion rods with a side size of 550 nm and a depth of 350 nm has been uniformly formed by electron beam lithography in large areas of 900x900 µm2. The active gammadion-PC has been designed to match the properties of the active photonic material by changing the geometrical parameters of the structure to obtain, eventually, enhanced performances of the PC device. The possibility to pattern active materials open the route to the development of new high performing optical devices such as organic light-emitting diodes, ultra-low threshold lasers, sensors and non-linear devices.
Active planar chiral metamaterials for light extraction
L Petti;M Rippa;P Mormile;S De Nicola;
2012
Abstract
In this paper a two-dimensional (2D) active nanograting photonic crystal (PC) which consists of air rods with a gammadion shape in a nanocomposite prepared by incorporating CdSe/CdS core/shell nanorods (NR) in a polymer is proposed and experimentally demonstrated. Scanning electron microscopy and spectra measurements are used to characterize the experimental structure. The vertical extraction of the light, by the coupling of the modes guided by the PQC slab to the free radiation via Bragg scattering, consists of a very narrow orange emission band at 610 nm with a full width at half-maximum (FWHM) of 14 nm. In this work the integration of CdSe/CdS core/shell nanorods in planar gammadion nanogratings is proposed as a new method to develop active devices based on organic photonics. The active nanocomposite containing colloidal semiconductor quantum rods of nanometer size scale is patterned to fabricate a 2D active PC. The 2D-PC pattern with gammadion rods with a side size of 550 nm and a depth of 350 nm has been uniformly formed by electron beam lithography in large areas of 900x900 µm2. The active gammadion-PC has been designed to match the properties of the active photonic material by changing the geometrical parameters of the structure to obtain, eventually, enhanced performances of the PC device. The possibility to pattern active materials open the route to the development of new high performing optical devices such as organic light-emitting diodes, ultra-low threshold lasers, sensors and non-linear devices.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
