Holographic fabrication of graded photonic super-quasi-crystals with multiple-level gradients
| Autor: | David Lowell, Murthada Adewole, Oliver Sale, Banglin Chen, Yuankun Lin, Noah Hurley, Usha Philipose, Safaa Hassan |
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| Rok vydání: | 2018 |
| Předmět: |
Diffraction
Materials science Fabrication Spatial light modulator business.industry Holography Phase (waves) Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics law.invention 010309 optics Optics law 0103 physical sciences Electrical and Electronic Engineering Photonics 0210 nano-technology business Engineering (miscellaneous) Photonic crystal Diode |
| Zdroj: | Applied optics. 57(22) |
| ISSN: | 1539-4522 |
| Popis: | Photonic quasi-crystals and photonic crystals with certain degrees of disorder can have a broadband light–matter interaction. In this paper, we present the holographic fabrication of graded photonic super-quasi-crystals through pixel-by-pixel phase pattern engineering using a spatial light modulator. Using the same phase pattern arranged in a decagon, we have fabricated graded photonic super-quasi-crystals with five-fold symmetry and multiple levels of gradients and graded photonic super-crystals with rectangular unit super-cells, depending on the Fourier filter. Although a certain degree of disorder was incorporated in the quasi-crystals, we still observed the golden ratio in the diameters of the diffraction rings of the fabricated quasi-crystals, indicating five-fold symmetry. Using direct pixel-by-pixel phase engineering, the same laser projection system, consisting of an integrated spatial light modulator and a reflective optical element, can be used for the fabrication of graded photonic super-crystals with various symmetries. The multi-level gradient effects on the optical properties of an organic light-emitting diode were simulated. When the cathode of an organic light-emitting device is patterned in the graded photonic super-crystals, a light extraction efficiency up to 76% in the visible range can be achieved. |
| Databáze: | OpenAIRE |
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