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Coherent Perfect Absorption in Higher Order Systems
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作者 Mengjun Fan Linxue Fu +1 位作者 Yaqiong Ding Xinming Fu 《Journal of Applied Mathematics and Physics》 2023年第3期737-745,共9页
We investigate the phenomenon of coherent perfect absorption in a high-order system with three passive resonators coupled to a super-surface to form this three-state coherent perfect absorber. The effective parity tim... We investigate the phenomenon of coherent perfect absorption in a high-order system with three passive resonators coupled to a super-surface to form this three-state coherent perfect absorber. The effective parity time (PT) symmetry in the passive system has received much attention, and in this open three-state PT symmetric system, the incident wave is used as the effective gain instead of balancing the material gain and loss. We analyze the variation of coherent perfect absorption of this system with the coupling coefficient of the system by simulation. 展开更多
关键词 Exceptional Point PT Symmetry Non-Hermitian System coherent perfect absorption
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Tunable coherent perfect absorption in three-dimensional Dirac semimetal films
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作者 Jipeng Wu Jie Tang +2 位作者 Rongzhou Zeng Xiaoyu Dai Yuanjiang Xiang 《Chinese Optics Letters》 SCIE EI CAS CSCD 2021年第8期63-68,共6页
In this article,we investigate the phenomenon of coherent perfect absorption(CPA)with bulk Dirac semimetal(BDS)thin film.CPA of BDS appears at the frequency of 43.89 THz with 0°phase modulation of two coherent in... In this article,we investigate the phenomenon of coherent perfect absorption(CPA)with bulk Dirac semimetal(BDS)thin film.CPA of BDS appears at the frequency of 43.89 THz with 0°phase modulation of two coherent input lights.Meanwhile,it shows that CPA can be realized under oblique incidence circumstances for both TM and TE polarizations.Moreover,the frequency of CPA can be adjusted by altering the thickness of BDS thin film,and the dynamic regulation of CPA can be realized by changing the Fermi energy.Finally,the peak coherent absorption frequency can be controlled by changing the degeneracy factor. 展开更多
关键词 coherent perfect absorption bulk Dirac semimetal thin film phase modulation
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All-optical dynamic focusing of light via coherent absorption in a plasmonic metasurface
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作者 Maria Papaioannou Eric Plum +1 位作者 Edward TF Rogers Nikolay I Zheludev 《Light(Science & Applications)》 SCIE EI CAS CSCD 2017年第1期114-120,共7页
Vision,microscopy,imaging,optical data projection and storage all depend on focusing of light.Dynamic focusing is conventionally achieved with mechanically reconfigurable lenses,spatial light modulators or microfluidi... Vision,microscopy,imaging,optical data projection and storage all depend on focusing of light.Dynamic focusing is conventionally achieved with mechanically reconfigurable lenses,spatial light modulators or microfluidics.Here we demonstrate that dynamic control of focusing can be achieved through coherent interaction of optical waves on a thin beam splitter.We use a nanostructured plasmonic metasurface of subwavelength thickness as the beam splitter,allowing operation in the regimes of coherent absorption and coherent transparency.Focusing of light resulting from illumination of the plasmonic metasurface with a Fresnel zone pattern is controlled by another patterned beam projected on the same metasurface.By altering the control pattern,its phase,or its intensity,we switch the lens function on and off,and alter the focal spot’s depth,diameter and intensity.Switching occurs as fast as the control beam is modulated and therefore tens of gigahertz modulation bandwidth is possible with electro-optical modulators,which is orders of magnitude faster than conventional dynamic focusing technologies. 展开更多
关键词 all-optical dynamic focusing coherent control coherent perfect absorption metasurfaces
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