Opticution

Opticution: Opticution is the term given to the damaging beyond viability of biological samples that are manipulated via optical traps, most commonly optical tweezers. The term was coined by Arthur Ashkin, who developed optical tweezers at Bell Labs in the 1970s and 80s. As different biological samples absorb different wavelengths, choosing the proper laser frequency can help to minimize the danger of opticution. Near-infrared diode lasers are a popular choice because of this and their relative inexpensiveness.

Recent work by Neumann (Characterization of photodamage to Escherichia coli in optical traps; BIOPHYSICAL JOURNAL 77 (5): 2856-2863 NOV 1999) has shown that for continuous lasers, such as those employed in optical traps, the damage seems to be a single-photon process (as opposed to the two-photon process found in pulsed lasers). Furthermore, the damage is related to the presence of oxygen, and use of an oxygen-scrubbing system can reduce optical damage indefinitely.

Categories:
Photonics
Biophysics
Optical trapping

Игры ⚽ Нужна курсовая?

Pince optique — Les pinces optiques sont des outils qui se basent sur la réfraction d’un faisceau laser en milieu transparent, pour maintenir et déplacer physiquement des objets diélectriques (qui ne conduisent pas le courant électrique) microscopiques. Ces… … Wikipédia en Français
Optical tweezers — (originally called single beam gradient force trap ) are scientific instruments that use a highly focused laser beam to provide an attractive or repulsive force (typically on the order of piconewtons), depending on the refractive index mismatch… … Wikipedia
Pinza óptica — Saltar a navegación, búsqueda Una pinza óptica es un instrumento científico que usa un rayo láser para proveer una fuerza atractiva o repulsiva, dependiendo del emparejamiento de índice (típicamente en el orden de pico Newtons) para sostener y… … Wikipedia Español

Academic Dictionaries and Encyclopedias