Shift vector as the geometric origin of beam shifts
Goos-Hanchen (GH) and Imbert-Fedorov (IF) shifts are lateral and transverse displacements of a wavepacket reflecting off a surface. A dramatic real-space manifestation of wavepacket phases, they have traditionally been analyzed in a model dependent fashion. Here we argue that GH and IF shifts adm...
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| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/138043 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Goos-Hanchen (GH) and Imbert-Fedorov (IF) shifts are lateral and transverse
displacements of a wavepacket reflecting off a surface. A dramatic real-space
manifestation of wavepacket phases, they have traditionally been analyzed in a
model dependent fashion. Here we argue that GH and IF shifts admit a general
geometrical description and arise from a gauge invariant geometric phase. In
particular, we show GH/IF shifts can be naturally captured by a shift vector,
analogous to the shift vector from shift currents in the bulk photovoltaic
effect. Employing Wilson loops to visualize the scattering processes
contributing to the shift vector, we separate the shift into an intrinsic
(depends solely on the system bulk) and an extrinsic part. This enables to
establish a clear model-independent link between symmetry and the
presence/absence of intrinsic and extrinsic GH/IF shifts. |
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