Laser-induced defect insertion in DNA-linked 2D colloidal crystal array
Abstract
Insertion of vacancies at predetermined sites within the lattice of colloidal crystals is a prerequisite in order to realize high-quality, opaline-based photonic devices. In this contribution, we demonstrate a novel methodology to afford controlled insertion of vacancies within two-dimensional (2D) opaline arrays. These 2D opaline arrays have been substrate-anchored with the help of DNA hybridization. This provides a heat-sensitive 'adhesive' between substrate and microspheres within a surrounding aqueous medium that enables tuning the hybridization strength of DNA linker as well as a mechanism to facilitate the removal of unbound microspheres. Focusing a laser beam onto the substrate/microsphere interface induces a localized heating event that detaches the irradiated microspheres, leaving behind vacancies. By repeating this process, line vacancies were successfully obtained. The effects of salt concentration, laser power, light-absorbing dyes, DNA length and refractive-index mismatch were investigated and found to correlate with heat-induced microsphere release.
- Publication:
-
Applied Physics A: Materials Science & Processing
- Pub Date:
- February 2009
- DOI:
- 10.1007/s00339-008-4799-1
- Bibcode:
- 2009ApPhA..94..339G
- Keywords:
-
- 42.70.Qs;
- 82.70.Dd;
- 81.16.Rf;
- 81.16.Fg;
- 81.16.Dn;
- 42.70.Qs;
- 82.70.Dd;
- 81.16.Rf;
- 81.16.Fg;
- 81.16.Dn;
- Photonic bandgap materials;
- Colloids;
- Nanoscale pattern formation;
- Supramolecular and biochemical assembly;
- Self-assembly