scholarly journals Dynamical Control of Broadband Coherent Absorption in ENZ Films

Micromachines ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 110 ◽  
Author(s):  
Vincenzo Bruno ◽  
Stefano Vezzoli ◽  
Clayton DeVault ◽  
Thomas Roger ◽  
Marcello Ferrera ◽  
...  
Keyword(s):  
Scattering Matrix ◽  
Subwavelength Structures ◽  
Optical Nonlinearities ◽  
Light Modulation ◽  
Peak Wavelength ◽  
Perfect Absorption ◽  
Maximum Value ◽  
Coherent Perfect Absorption ◽  
On Chip ◽  
Dynamical Control

Interferometric effects between two counter-propagating beams incident on an optical system can lead to a coherent modulation of the absorption of the total electromagnetic radiation with 100% efficiency even in deeply subwavelength structures. Coherent perfect absorption (CPA) rises from a resonant solution of the scattering matrix and often requires engineered optical properties. For instance, thin film CPA benefits from complex nanostructures with suitable resonance, albeit at a loss of operational bandwidth. In this work, we theoretically and experimentally demonstrate a broadband CPA based on light-with-light modulation in epsilon-near-zero (ENZ) subwavelength films. We show that unpatterned ENZ films with different thicknesses exhibit broadband CPA with a near-unity maximum value located at the ENZ wavelength. By using Kerr optical nonlinearities, we dynamically tune the visibility and peak wavelength of the total energy modulation. Our results based on homogeneous thick ENZ media open a route towards on-chip devices that require efficient light absorption and dynamical tunability.

Coherent perfect absorption in the one-dimensional non-magnetized plasma photonic crystals

2021 ◽  
Author(s):  
Fupei Wu ◽  
Hao Zhang ◽  
Baofei Wan ◽  
Haifeng Zhang
Keyword(s):  
Photonic Crystals ◽  
Optical Switching ◽  
Absorption Efficiency ◽  
Magnetized Plasma ◽  
Light Modulation ◽  
Perfect Absorption ◽  
One Dimensional ◽  
Coherent Perfect Absorption ◽  
Plasma Photonic Crystals ◽  
The One

Abstract Electromagnetic (EM) absorption is the basic characteristic of materials that plays an important role in many applications such as solar cells, EM radiation protection, and stealth technology. However, under normal circumstances, the traditional medium's absorption efficiency of EM waves is limited, but the designer can operate by adjusting the structure of the medium. In this paper, the coherent perfect absorption (CPA) is introduced in the one-dimensional (1-D) non-magnetized plasma photonic crystals. Under the premise that the selected material meets the conditions (appropriate thickness and dielectric constant), the absorption amplitude at the frequency point that meets the coherent absorption conditions is greatly improved. The results show that the forward and backward EM waves that meet the CPA conditions and propagate in PPCs can increase the absorption to 99.94% and change the phase difference of the two coherent beams to control the adjustment range of the absorption efficiency to 12.60%-99.94%. In addition, the effects of plasma and collision frequency on the absorption property, and the effects of the periodic constant of dielectric layers and plasma thickness on the frequency and amplitude of coherent absorption are also presented. It is foreseeable that the idea of tunability of light absorption in photovoltaic cells is proposed in this paper, and the application of absorbers in the field of optical switching and light modulation has been further expanded.

scholarly journals Interferometric control of magnon-induced nearly perfect absorption in cavity magnonics

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
J. W. Rao ◽  
P. C. Xu ◽  
Y. S. Gui ◽  
Y. P. Wang ◽  
Y. Yang ◽  
...  
Keyword(s):  
Electromagnetic Waves ◽  
Molecular Detection ◽  
Coupled System ◽  
Critical Coupling ◽  
Perfect Absorption ◽  
Reflection And Transmission ◽  
Single Beam ◽  
Coherent Perfect Absorption ◽  
Channel Interference ◽  
On Chip

AbstractThe perfect absorption of electromagnetic waves has promoted many applications, including photovoltaics, radar cloaking, and molecular detection. Unlike conventional methods of critical coupling that require asymmetric boundaries or coherent perfect absorption that require multiple coherent incident beams, here we demonstrate single-beam perfect absorption in an on-chip cavity magnonic device without breaking its boundary symmetry. By exploiting magnon-mediated interference between two internal channels, both reflection and transmission of our device can be suppressed to zero, resulting in magnon-induced nearly perfect absorption (MIPA). Such interference can be tuned by the strength and direction of an external magnetic field, thus showing versatile controllability. Furthermore, the same multi-channel interference responsible for MIPA also produces level attraction (LA)-like hybridization between a cavity magnon polariton mode and a cavity photon mode, demonstrating that LA-like hybridization can be surprisingly realized in a coherently coupled system.

[INVITED] Coherent perfect absorption of electromagnetic wave in subwavelength structures

2018 ◽  
Vol 101 ◽  
pp. 499-506 ◽  
Author(s):  
Chao Yan ◽  
Mingbo Pu ◽  
Jun Luo ◽  
Yijia Huang ◽  
Xiong Li ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Subwavelength Structures ◽  
Perfect Absorption ◽  
Coherent Perfect Absorption

Organic Sub-Bandgap Schottky Barrier Photodetectors with Near-Infrared Coherent Perfect Absorption

ACS Photonics ◽  
2021 ◽  
Author(s):  
Yeonghoon Jin ◽  
Hyung Suk Kim ◽  
Junghoon Park ◽  
Seunghyup Yoo ◽  
Kyoungsik Yu
Keyword(s):  
Schottky Barrier ◽  
Near Infrared ◽  
Perfect Absorption ◽  
Coherent Perfect Absorption

scholarly journals Driving plasmonic nanoantennas at perfect impedance matching using generalized coherent perfect absorption

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Philipp Grimm ◽  
Gary Razinskas ◽  
Jer-Shing Huang ◽  
Bert Hecht
Keyword(s):  
Impedance Matching ◽  
Plasmonic Waveguide ◽  
Perfect Absorption ◽  
Single Nanowire ◽  
Coherent Perfect Absorption ◽  
Potential Applications ◽  
Plasmonic Nanoantennas ◽  
Radiative Losses ◽  
Additional Loss

Abstract Coherent perfect absorption (CPA) describes the absence of all outgoing modes from a lossy resonator, driven by lossless incoming modes. Here, we show that for nanoresonators that also exhibit radiative losses, e.g., plasmonic nanoantennas, a generalized version of CPA (gCPA) can be applied. In gCPA outgoing modes are suppressed only for a subset of (guided plasmonic) modes while other (radiative) modes are treated as additional loss channels - a situation typically referred to as perfect impedance matching. Here we make use of gCPA to show how to achieve perfect impedance matching between a single nanowire plasmonic waveguide and a plasmonic nanoantenna. Antennas with both radiant and subradiant characteristics are considered. We further demonstrate potential applications in background-free sensing.

Tunable coherent perfect absorption in three-dimensional Dirac semimetal films

2021 ◽  
Vol 19 (8) ◽  
pp. 081601
Author(s):  
Jipeng Wu ◽  
Jie Tang ◽  
Rongzhou Zeng ◽  
Xiaoyu Dai ◽  
Yuanjiang Xiang
Keyword(s):  
Three Dimensional ◽  
Perfect Absorption ◽  
Dirac Semimetal ◽  
Coherent Perfect Absorption

An electromagnetic perspective of coherent perfect absorption

2018 ◽  
Vol 94 (1) ◽  
pp. 015502
Author(s):  
Sanjeeb Dey ◽  
Suneel Singh
Keyword(s):  
Perfect Absorption ◽  
Coherent Perfect Absorption

Coherent perfect absorption in unpatterned thin films of intrinsic semiconductor

2020 ◽  
Vol 49 (3) ◽  
pp. 342-350
Author(s):  
Md. Alamgir Badsha ◽  
Md. Humaun Kabir ◽  
Mohammad Abdur Rashid
Keyword(s):  
Thin Films ◽  
Perfect Absorption ◽  
Intrinsic Semiconductor ◽  
Coherent Perfect Absorption
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