scholarly journals Thermo-optically induced transparency on a photonic chip

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Marco Clementi ◽  
Simone Iadanza ◽  
Sebastian A. Schulz ◽  
Giulia Urbinati ◽  
Dario Gerace ◽  
...  
Keyword(s):  
Quantum Interference ◽  
Room Temperature ◽  
Electromagnetically Induced Transparency ◽  
Low Cost ◽  
Optical Cavity ◽  
Optical Modulators ◽  
Crystal Resonator ◽  
Potential Applications ◽  
Induced Transparency ◽  
Optically Induced

AbstractControlling the optical response of a medium through suitably tuned coherent electromagnetic fields is highly relevant in a number of potential applications, from all-optical modulators to optical storage devices. In particular, electromagnetically induced transparency (EIT) is an established phenomenon in which destructive quantum interference creates a transparency window over a narrow spectral range around an absorption line, which, in turn, allows to slow and ultimately stop light due to the anomalous refractive index dispersion. Here we report on the observation of a new form of both induced transparency and amplification of a weak probe beam in a strongly driven silicon photonic crystal resonator at room temperature. The effect is based on the oscillating temperature field induced in a nonlinear optical cavity, and it reproduces many of the key features of EIT while being independent of either atomic or mechanical resonances. Such thermo-optically induced transparency will allow a versatile implementation of EIT-analogs in an integrated photonic platform, at almost arbitrary wavelength of interest, room temperature and in a practical, low cost, and scalable system.

scholarly journals Dual-Tunable Polarization Insensitive Electromagnetically Induced Transparency in Metamaterials

2021 ◽  
Author(s):  
Renxia Ning ◽  
Zhiqiang Xiao ◽  
Zhenhai Chen ◽  
Wei Huang
Keyword(s):  
Vanadium Dioxide ◽  
Mode Coupling ◽  
Slow Light ◽  
Chemical Potential ◽  
Electromagnetically Induced Transparency ◽  
Dark Mode ◽  
Potential Applications ◽  
Polarization Insensitive ◽  
Terahertz Devices ◽  
Induced Transparency

AbstractA multilayer structure of a square ring of graphene with nesting vanadium dioxide (VO2) was investigated in this study. This structure exhibits electromagnetically induced transparency (EIT), which stems from a bright mode coupling with a dark mode. The permittivity values of graphene and VO2 can be modulated via chemical potential and temperature, respectively. The EIT effect can be tuned based on the chemical potential of graphene and temperature of VO2, resulting in a dual-tunable EIT effect. Simulation results confirmed that this dual-tunable EIT phenomenon is insensitive to polarization. These results may have potential applications in terahertz devices, such as slow light devices, switching devices, and sensors.

FIELD-INDUCED QUANTUM INTERFERENCE IN SEMICONDUCTOR QUANTUM WELLS FOR LASING WITHOUT POPULATION INVERSION AND ELECTROMAGNETICALLY INDUCED TRANSPARENCY

1995 ◽  
Vol 04 (02) ◽  
pp. 261-282 ◽  
Author(s):  
Y. ZHAO ◽  
D. HUANG ◽  
C. WU
Keyword(s):  
Quantum Wells ◽  
Quantum Interference ◽  
Population Inversion ◽  
Electromagnetically Induced Transparency ◽  
Random Phase ◽  
Nonlinear Susceptibility ◽  
Double Quantum ◽  
Single Quantum Well ◽  
Semiconductor Quantum Wells ◽  
Induced Transparency

This paper presents the current results of field-induced quantum interference in semiconductor quantum wells. Three-level systems with two conduction subbands in single and double quantum wells coupled by a resonant field are studied. We investigate effects of the Coulomb and field-induced electronic renormalizations of the energy subbands and steady eigenstates of electrons. The random-phase and ladder approximations have been used to calculate the linear interband and intersubband optical absorptions and refractive indices. The effect of collective dipole moment on the nonlinear susceptibility has been incorporated into the study by using a local-field approach. Lasing without population inversion, electromagnetically induced transparency, and enhanced nonlinearity with reduced absorption inside the intersubband-coupled single quantum well and dc-field coupled double quantum wells are found.

Electromagnetically-induced transparency and slow light in room temperature 4He*

Laser Physics ◽  
2010 ◽  
Vol 20 (5) ◽  
pp. 1234-1243
Author(s):  
J. Ghosh ◽  
F. Goldfarb ◽  
J. -L. Gouët ◽  
F. Bretenaker ◽  
R. Ghosh
Keyword(s):  
Room Temperature ◽  
Slow Light ◽  
Electromagnetically Induced Transparency ◽  
Induced Transparency

Experimental Verification of Circuit Analog of Three- and Four-Level Electromagnetically Induced Transparency

2011 ◽  
Vol 415-417 ◽  
pp. 1340-1349 ◽  
Author(s):  
Xi Chen ◽  
Xia Min Leng ◽  
Jing Xin Li ◽  
Yi Tsen Yeh ◽  
Teh Chau Liau ◽  
...  
Keyword(s):  
Quantum Interference ◽  
Electromagnetically Induced Transparency ◽  
External Control ◽  
Atomic Systems ◽  
Classical Counterpart ◽  
Atomic Vapors ◽  
Capacitor Coupling ◽  
Atom Interaction ◽  
And Control ◽  
Induced Transparency

Since a two-level resonant atomic system can be simulated by a simple circuit, three- and four-level electromagnetically induced transparency (EIT) that occur due to light-atom interaction can find its classical counterpart in circuit analog. As the optical response of an EIT atomic medium (including atomic vapors and semiconductor-quantum-dot dielectrics) can be controlled via tunable quantum interference induced by applied external control fields, in the scheme of circuit analog, such a controllable manipulation is achieved via capacitor coupling, where two loops are coupled by a capacitor that can represent the applied control fields in atomic EIT. Both numerical simulation and experimental demonstration of three- and four-level EIT were performed based on such a scenario of circuit analog. The classical “coherence” relevant to quantum interference among transitions pathways driven by both probe and control fields in EIT atomic systems has been manifested in the present circuit analog of EIT.

scholarly journals Sensing Enhancement of Electromagnetically Induced Transparency Effect in Terahertz Metamaterial by Substrate Etching

2021 ◽  
Vol 9 ◽  
Author(s):  
Tingling Lin ◽  
Yi Huang ◽  
Shuncong Zhong ◽  
Manting Luo ◽  
Yujie Zhong ◽  
...  
Keyword(s):  
Electric Field ◽  
Electromagnetically Induced Transparency ◽  
High Sensitivity ◽  
Strong Light ◽  
Refractive Index Sensing ◽  
Quadrupole Resonance ◽  
Matter Interaction ◽  
Potential Applications ◽  
Light Matter Interaction ◽  
Induced Transparency

A broad range of terahertz (THz) metamaterials have been developed for refractive index sensing. However, most of these metamaterials barely make sufficient use of the excited electric field which is crucial to achieve high sensitivity. Here, we proposed a metamaterial sensor possessing electromagnetically induced transparency (EIT) resonance that is formed by the interference of dipole and quadrupole resonance. In particular, the strengthening of light-matter interaction is realized through substrate etching, leading to a remarkable improvement in sensitivity. Hence, three kinds of etching mode were presented to maximize the utilization of the electric field, and the corresponding highest sensitivity is enhanced by up to ~2.2-fold, from 0.260 to 0.826 THz/RIU. The proposed idea to etch substrate with a strong light-matter interaction can be extended to other metamaterial sensors and possesses potential applications in integrating metamaterial and microfluid for biosensing.

scholarly journals Wideband and Large Angle Electromagnetically Induced Transparency by the Equivalent Transmission Line in a Metasurface

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Renxia Ning ◽  
Dekai Li ◽  
Tianlong Yang ◽  
Zhenhai Chen ◽  
Hongwen Qian
Keyword(s):  
Time Domain ◽  
Symmetry Axis ◽  
Electromagnetically Induced Transparency ◽  
Incident Angle ◽  
Large Angle ◽  
Integration Time ◽  
Main Structure ◽  
Potential Applications ◽  
Equivalent Circuit Method ◽  
Induced Transparency

Abstract A classical structure for a U-shaped metasurface exhibiting a wideband and large angle electromagnetically induced transparency (EIT) effect in the terahertz range is proposed. One horizontal and two vertical strips, which represent the bright and dark modes, respectively, are created for the U-shaped structure. The finite integration time domain (FITD) and equivalent circuit method are compared with the EIT result. The EIT effect is affected by the length of the vertical bar and by the distance from the vertical bar to the symmetry axis. The results show that the asymmetry of the main structure in the x and y axes makes it easier to achieve the EIT effect. In addition, by changing the incident angle, the EIT effect always exists until the angle of the incidental electromagnetic wave is 85 degrees. These results have many potential applications for terahertz filtering, large-angle switching and sensors.

A tailored ultra-broadband electromagnetically induced transparency metamaterial based on graphene

2021 ◽  
Author(s):  
Fenying Li ◽  
Tao Zhang ◽  
Quan-Fang Chen ◽  
Haining Ye ◽  
Xinlei Zhang ◽  
...  
Keyword(s):  
Slow Light ◽  
Electromagnetically Induced Transparency ◽  
Incidence Angle ◽  
Polarization State ◽  
Optical Switches ◽  
Optical Modulators ◽  
Low Loss ◽  
Wave Effect ◽  
Loss Index ◽  
Induced Transparency

Abstract Based on graphene, an ultra-broadband electromagnetically induced transparency (EIT) window with dynamic tunability is realized in theory. Through altering the Fermi level of graphene that can be regulated by the external voltage, the EIT window and the EIT effect, especially the slow-wave effect, can be easily adjusted. Moreover, the bandwidth of the EIT window can be changed by the incidence angle, achieving the transformation from broadband to narrowband. At the same time, by discussing the polarization state and loss index, the characteristics of polarization insensitivity and low loss are proved. Additionally, the influences of other parameters are discussed, such as the relaxation time of graphene and coupling distance. These unique features enable the designed EIT metamaterial to be masterly applied to optical switches, optical modulators, and slow-light devices.

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