Abstract
Second-order nonlinear processes are electric-dipole-forbidden in centrosymmetric materials. For organic materials, noncentrosymmetry is relatively easy to achieve on the molecular level. However, for macroscopic noncentrosymmetry, such materials need to be poled. This results in a thermodynamically unstable material whose nonlinearity tends to relax with time. Isotropic materials are usually also neglected as second-order materials. However, isotropic chiral materials are noncentrosymmetric and possess a nonvanishing second-order response, as shown by sum-frequency generation.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 27-28 |
| Number of pages | 2 |
| Journal | LEOS Summer Topical Meeting |
| State | Published - 1998 |
| Externally published | Yes |
| Event | Proceedings of the 1998 IEEE/LEOS Summer Topical Meeting - Monterey, CA, USA Duration: Jul 20 1998 → Jul 24 1998 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering