토토 승무패PHYSICS/BK21 SEMINAR[09.06.10]pm4:00~
관련링크
본문
"
“Coherent reflection and focusing of
He atom beams from rough surfaces
at near-grazing incidence”
♦Speaker :토토 승무패Dr. Bum Suk Zhao (Max-Planck-Institute, Germany)
♦Place : Physics Seminar Room (Science Bldg, 3-201)
♦Date & Time : June, 10(Wed)토토 승무패4:00토토 승무패~토토 승무패5:00 pm
Abstract
We observe coherent reflection토토 승무패of토토 승무패thermal토토 승무패He atom beams from various microscopically-rough
surfaces at토토 승무패grazing토토 승무패incidence.토토 승무패For토토 승무패a토토 승무패sufficiently토토 승무패small토토 승무패normal component kz of the incident
wave-vector of토토 승무패the atom the reflection토토 승무패probability is found to be a토토 승무패function토토 승무패of토토 승무패kz토토 승무패only.토토 승무패This
behavior is explained by토토 승무패quantum-reflection토토 승무패at토토 승무패the attractive branch토토 승무패of토토 승무패the토토 승무패Casimir-van토토 승무패der
Waals토토 승무패interaction토토 승무패potential [1].토토 승무패For토토 승무패larger토토 승무패values토토 승무패of토토 승무패kz토토 승무패 the토토 승무패reflection probability is found to
increase with parallel토토 승무패component토토 승무패kx토토 승무패for토토 승무패a토토 승무패given kz.토토 승무패The material specific토토 승무패kx토토 승무패dependence토토 승무패is
discussed in terms of an토토 승무패effective토토 승무패averaging-out of the surface roughness and the atom-surface
Casimir-van der Waals potential under토토 승무패grazing incidence conditions. The coherent reflection at
grazing incidence is exploited to focus토토 승무패He atom beams in one dimension down to 2 ㎛ with토토 승무패a
Concave cylindrical mirror. The토토 승무패mirror is made out of quartz and has a curvature radius of 78 m.
The focal length can be adjusted by varying the incidence angle. With a relatively large focal length,
the spot size gets larger with increasing source size and increasing deBroglie-wavelength. On the
other hand, when the focal length is adjusted to a small value by decreasing the incidence angle,
the focal spot size is mainly determined by spherical aberration of the mirror.
Contact Person : Prof. Nam Ki Lee (054-279-2097, nklee@postech.ac.kr)
"
“Coherent reflection and focusing of
He atom beams from rough surfaces
at near-grazing incidence”
♦Speaker :토토 승무패Dr. Bum Suk Zhao (Max-Planck-Institute, Germany)
♦Place : Physics Seminar Room (Science Bldg, 3-201)
♦Date & Time : June, 10(Wed)토토 승무패4:00토토 승무패~토토 승무패5:00 pm
Abstract
We observe coherent reflection토토 승무패of토토 승무패thermal토토 승무패He atom beams from various microscopically-rough
surfaces at토토 승무패grazing토토 승무패incidence.토토 승무패For토토 승무패a토토 승무패sufficiently토토 승무패small토토 승무패normal component kz of the incident
wave-vector of토토 승무패the atom the reflection토토 승무패probability is found to be a토토 승무패function토토 승무패of토토 승무패kz토토 승무패only.토토 승무패This
behavior is explained by토토 승무패quantum-reflection토토 승무패at토토 승무패the attractive branch토토 승무패of토토 승무패the토토 승무패Casimir-van토토 승무패der
Waals토토 승무패interaction토토 승무패potential [1].토토 승무패For토토 승무패larger토토 승무패values토토 승무패of토토 승무패kz토토 승무패 the토토 승무패reflection probability is found to
increase with parallel토토 승무패component토토 승무패kx토토 승무패for토토 승무패a토토 승무패given kz.토토 승무패The material specific토토 승무패kx토토 승무패dependence토토 승무패is
discussed in terms of an토토 승무패effective토토 승무패averaging-out of the surface roughness and the atom-surface
Casimir-van der Waals potential under토토 승무패grazing incidence conditions. The coherent reflection at
grazing incidence is exploited to focus토토 승무패He atom beams in one dimension down to 2 ㎛ with토토 승무패a
Concave cylindrical mirror. The토토 승무패mirror is made out of quartz and has a curvature radius of 78 m.
The focal length can be adjusted by varying the incidence angle. With a relatively large focal length,
the spot size gets larger with increasing source size and increasing deBroglie-wavelength. On the
other hand, when the focal length is adjusted to a small value by decreasing the incidence angle,
the focal spot size is mainly determined by spherical aberration of the mirror.
Contact Person : Prof. Nam Ki Lee (054-279-2097, nklee@postech.ac.kr)
"
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