All-optical reversible control of integrated resonant cavity by a self-assembled azobenzene monolayer
| Autor: | Andre Kovach, Dongyu Chen, Raymond Yu, Jinghan He, Patrick J. G. Saris, Andrea M. Armani |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
business.industry 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences Atomic and Molecular Physics and Optics law.invention 010309 optics chemistry.chemical_compound Resonator Wavelength Azobenzene chemistry law Excited state 0103 physical sciences Monolayer Optoelectronics Molecule Photonics 0210 nano-technology business |
| Zdroj: | Optics express. 28(15) |
| ISSN: | 1094-4087 |
| Popis: | The next frontier in photonics will rely on the synergistic combination of disparate material systems. One unique organic molecule is azobenzene. This molecule can reversibly change conformations when optically excited in the blue (trans-to-cis) or mid-IR (cis-to-trans). Here, we form an oriented monolayer of azobenzene-containing 4-(4-diethylaminophenylazo)pyridine (Aazo) on SiO2 optical resonators. Due to the uniformity of the Aazo layers, quality factors over 106 are achieved. To control the photo-response, the density of Aazo groups is tuned by integrating methyl spacer molecules. Using a pair of lasers, the molecule is reversibly flipped between molecular conformations, inducing a refractive index change which results in a resonant wavelength shift. The magnitude of the shift scales with the relative surface density of Aazo. To investigate reproducibility and stability of the organic monolayer, three switching cycles are demonstrated, and the performance is consistent even after a device is stored in air for 6 months. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|