Unified theory for perfect absorption in ultrathin absorptive films with constant tangential electric or magnetic fields

Luo, Jie; Li, Sucheng; Hou, Bo; Lai, Yun

doi:10.1103/physrevb.90.165128

Cited by 46 publications

(39 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to conditions of CPA and laser as shown in our paper, this material with sample thickness d = 43.673 m can act as a CPA laser. Then we might as well make this thickness equal to 14 radii of the cylinders are given as r 1 = 0.16a, r 2 = 0.48a, then we achieved the permittivities of the cylinders as ε 1 = 1.33 + 0.11i, ε 2 = 1.07 − 0.054i with both gain and loss from Eq. (A4) with m = 0 and m = 1.…”

Section: Discussionmentioning

confidence: 99%

“…This can also be understood from Eq. (14). For such a medium with a real refractive index, both the numerator and denominator of det(S) are complex functions of frequency and they do not vanish for any real frequency.…”

Section: Theoretical Analysis On Cpa and Laser By Zimglmentioning

confidence: 99%

“…Numerous intriguing optical phenomena have been observed in optical P T -symmetric systems, such as P T -symmetry phase transition and exceptional points [5][6][7][8], unidirectional invisibility [9,10], etc. Especially, an optical P T -symmetric medium can simultaneously behave as a coherent perfect absorber with 100% absorption [11][12][13][14], and as a laser oscillator [15,16] by simply adjusting the amplitudes and phases of incoming waves. Such a unique device is denoted as a CPA laser [17,18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simultaneous realization of a coherent perfect absorber and laser by zero-index media with both gain and loss

et al. 2016

Self Cite

View full text Add to dashboard Cite

We investigate a unique type of zero-index medium with both gain and loss (ZIMGL), whose effective permittivity and permeability are both purely imaginary but of opposite signs. We analytically show that, by using a slab of ZIMGL with equal magnitude of loss and gain, simulation realization of a coherent perfect absorber (CPA) and laser, i.e., the so-called CPA laser, can be achieved. Previously the CPA laser was proposed in parity-time (P T ) symmetric systems. However, the ZIMGL does not possess the P T symmetry and thus the underlying physics is distinctly different. By designing a photonic crystal (PC) composed of core-shell rods, with loss and gain distributed in either the core or the shell, we have realized such a ZIMGL. The CPA-laser functionality of such a PC is also confirmed in our numerical simulations. Our work provides a different approach for simultaneous realization of CPA and laser besides P T -symmetric systems.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Theoretical Analysis On Cpa and Laser By Zimglmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simultaneous realization of a coherent perfect absorber and laser by zero-index media with both gain and loss

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…The energy flux flows from the right to the left inside the slab, indicating that the lossy metasurface absorbs waves from both sides, while the metasurface with gain radiates toward both sides. In this sense, the functionality of PT-symmetric metasurfaces is a pair of coherent perfect absorption or lasing [60,61], denoted as a CPA-laser pair, as illustrated in Fig. 2…”

mentioning

confidence: 99%

Electromagnetic Impurity-Immunity Induced by Parity-Time Symmetry

Luo

Lai

2018

Phys. Rev. X

Self Cite

View full text Add to dashboard Cite

Impurities usually play an important role in modifying the bulk properties of electronic or electromagnetic materials. In this work, we demonstrate a way to break this discipline and realize the extraordinary physical property of impurity-immunity, which leads to perfect transmission irrespective of embedded impurities of almost any material and shape. This extraordinary property comes from the exceptional points of a pair of parity-time (PT)-symmetric metasurfaces sandwiching a slab of epsilonnear-zero medium. By systematically investigating the PT-symmetric metasurfaces sandwiching a slab of dielectrics or metamaterials, we obtain the two complementary solutions of exceptional points corresponding to perfect transmission. Interestingly, when the permittivity of the slab approaches zero, the two solutions of exceptional points coalesce into one exceptional point. At such a critical point, we find that the original "doping" effect of impurities in epsilon-near-zero media, proposed by Nader Engheta's group very recently [I. Liberal et al., Science 355, 1058(2017], is significantly suppressed. Our work shows that exceptional points can be used to eliminate scattering of impurities in a bulk medium.

show abstract

“…where ε 0 is the permittivity of free space and c is the speed of light [8,49,50]. In the absence of gain, energy conservation requires that…”

Section: Arxiv:170603694v2 [Physicsoptics] 14 Aug 2017 Theoretical mentioning

confidence: 99%

Coherent perfect absorbers: linear control of light with light

et al. 2017

View full text Add to dashboard Cite

Absorption of electromagnetic energy by a material is a phenomenon that underlies many applied problems, including molecular sensing, photocurrent generation and photodetection. Commonly, the incident energy is delivered to the system through a single channel, for example by a plane wave incident on one side of an absorber. However, absorption can be made much more efficient by exploiting wave interference. A coherent perfect absorber is a system in which complete absorption of electromagnetic radiation is achieved by controlling the interference of multiple incident waves. Here, we review recent advances in the design and applications of such devices. We present the theoretical principles underlying the phenomenon of coherent perfect absorption and give an overview of the photonic structures in which it can be realized, including planar and guidedmode structures, graphene-based systems, parity-and time-symmetric structures, 3D structures and quantum-mechanical systems. We then discuss possible applications of coherent perfect absorption in nanophotonics and, finally, we survey the perspectives for the future of this field.

show abstract

Unified theory for perfect absorption in ultrathin absorptive films with constant tangential electric or magnetic fields

Cited by 46 publications

References 66 publications

Simultaneous realization of a coherent perfect absorber and laser by zero-index media with both gain and loss

Simultaneous realization of a coherent perfect absorber and laser by zero-index media with both gain and loss

Electromagnetic Impurity-Immunity Induced by Parity-Time Symmetry

Coherent perfect absorbers: linear control of light with light

Contact Info

Product

Resources

About