Perfect electromagnetic absorption at one-atom-thick scale

Li, Sucheng; Duan, Qian; Li, Shuo; Yin, Qiang; Lu, Wen‐Zhong; Li, Liang; Gu, Bin; Hou, Bo; Wen, Weijia

doi:10.1063/1.4935427

Cited by 30 publications

(19 citation statements)

References 40 publications

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“…(14). We derived exact expressions for the conditions of lasing threshold in (17) and of coherent perfect absorber in (31) and (32). We employ a perturbative approach to obtain optimal conditions arising from the system parameters.…”

Section: Discussionmentioning

confidence: 99%

PT-symmetric coherent perfect absorber with graphene

Sarisaman

Taş

2018

J. Opt. Soc. Am. B

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We investigate PT -symmetric coherent perfect absorbers (CPAs) in the TE mode solution of a linear homogeneous optical system surrounded by graphene sheets. It is revealed that presence of graphene sheets contributes the enhancement of absorption in a coherent perfect absorber. We derive exact analytic expressions, and work through their possible impacts on lasing threshold and CPA conditions. We point out roles of each parameter governing optical system with graphene and show that optimal conditions of these parameters give rise to enhancement and possible experimental realization of a CPA laser. Presence of graphene leads the required gain amount to reduce considerably based on its chemical potential and temperature. We obtain that relation between system parameters decides the measure of CPA condition. We find out that graphene features contributing to resonance effect in graphene sheets are rather preferable to build a better coherent perfect absorber.

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Section: Discussionmentioning

confidence: 99%

PT-symmetric coherent perfect absorber with graphene

Sarisaman

Taş

2018

J. Opt. Soc. Am. B

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“…As a time‐reversed process of the laser, the original CPA is extremely narrowband and not suitable for either the photovoltaic or stealth applications . With an ingenious concept of dispersion engineering, Pu et al theoretically demonstrated that metasurface‐based CPA can be simultaneously extremely thin and broadband (Figure d), which was further experimentally demonstrated by various groups . As validated more recently, a thin layer of resistive sheet can be used as a near perfect absorber in the radio frequency (Figure e), where the thickness‐wavelength ratio is as small as 8 × 10 −5 , implying that the broadband CPA has broken the Planck–Rozanov limit for absorbers…”

Section: Functional Metasurfaces For Engineering Applicationsmentioning

confidence: 97%

Subwavelength Optical Engineering with Metasurface Waves

Luo

2018

Advanced Optical Materials

162

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Figure 3. Plasmonic superlens and hyperlens. a) Plasmonic EYI effect in structured metal film. Adapted with permission. [46] Copyright 2004, American Institute of Physics (AIP). b) Schematic of the optical system for the demonstration of thin film superlens. Adapted with permission. [49] Figure 11. Multifunctional metasurfaces. a) The far-field intensity distribution of wave-fronts with positive (red) and negative (blue) helicities emerging from segmented, interleaved, and harmonic response metasurfaces composed of gap-plasmon nanoantennas (inset). Adapted with permission. [167] Copyright 2016, AAAS. b) Schematic of the generation of a solid and a hollow spot at two wavelengths and the calculated intensity distribution in the focal plane. Adapted with permission. [12]

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“…As predicted by Pu et al, this broadband absorption can be seen as a time‐reverse process of oscillating electric current sheet, which is intrinsically broadband, unlike the resonant nature of lasing and antilasing process . It is striking that even a sub‐nanometric thick resistive metal or graphene can absorb almost all incoming microwaves under coherent conditions . Therefore, the broadband coherent perfect absorption provides a general guidance on how to design broadband absorbers with significantly reduced thickness and increased bandwidth. 4)Classic absorbers are often not tunable once fabricated.…”

Section: Theories Devices and Systems For Engineering Optics 20mentioning

confidence: 99%

Subwavelength Artificial Structures: Opening a New Era for Engineering Optics

Luo

2018

Advanced Materials

169

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In the past centuries, the scale of engineering optics has evolved toward two opposite directions: one is represented by giant telescopes with apertures larger than tens of meters and the other is the rapidly developing micro/nano‐optics and nanophotonics. At the nanoscale, subwavelength light–matter interaction is blended with classic and quantum effects in various functional materials such as noble metals, semiconductors, phase‐change materials, and 2D materials, which provides unprecedented opportunities to upgrade the performance of classic optical devices and overcome the fundamental and engineering difficulties faced by traditional optical engineers. Here, the research motivations and recent advances in subwavelength artificial structures are summarized, with a particular emphasis on their practical applications in super‐resolution and large‐aperture imaging systems, as well as highly efficient and spectrally selective absorbers and emitters. The role of dispersion engineering and near‐field coupling in the form of catenary optical fields is highlighted, which reveals a methodology to engineer the electromagnetic response of complex subwavelength structures. Challenges and tentative solutions are presented regarding multiscale design, optimization, fabrication, and system integration, with the hope of providing recipes to transform the theoretical and technological breakthroughs on subwavelength hierarchical structures to the next generation of engineering optics, namely Engineering Optics 2.0.

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Perfect electromagnetic absorption at one-atom-thick scale

Cited by 30 publications

References 40 publications

PT-symmetric coherent perfect absorber with graphene

PT-symmetric coherent perfect absorber with graphene

Subwavelength Optical Engineering with Metasurface Waves

Subwavelength Artificial Structures: Opening a New Era for Engineering Optics

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