تقرير
Time Driven Subwavelength Focusing with Negative Refraction
| العنوان: | Time Driven Subwavelength Focusing with Negative Refraction |
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| المؤلفون: | Dubois, M., Bossy, E., Enoch, S., Guenneau, S., Lerosey, G., Sebbah, P. |
| المصدر: | Phys. Rev. Lett. 114, 013902 January 2015 |
| سنة النشر: | 2013 |
| المجموعة: | Condensed Matter Physics (Other) |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Physics - Optics |
| الوصف: | Flat lens concept based on negative refraction proposed by Veselago in 1968 has been mostly investigated in monochromatic regime. It was recently recognized that time development of the super-lensing effect discovered in 2000 by Pendry is yet to be assessed and may spring surprises: Time-dependent illumination could improve the spatial resolution of the focusing. We investigate dynamics of flexural wave focusing by a 45\degre-tilted square lattice of circular holes drilled in a Duraluminium plate. Time-resolved experiments reveal that the focused image shrinks with time below diffraction limit, with a lateral resolution increasing from 0.8 $\lambda$ to 0.35 $\lambda$, whereas focusing under harmonic excitation remains diffraction limited. Modal analysis reveals the role in pulse reconstruction of radiating lens resonances, which repeatedly self-synchronize at the focal spot to shape a super-oscillating field. Comment: 5 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.114.013902 |
| URL الوصول: | http://arxiv.org/abs/1303.3022 |
| رقم الأكسشن: | edsarx.1303.3022 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.114.013902 |
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