scholarly journals Hyperbolic optics and superlensing in room-temperature KTN from self-induced k-space topological transitions

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yehonatan Gelkop ◽  
Fabrizio Di Mei ◽  
Sagi Frishman ◽  
Yehudit Garcia ◽  
Ludovica Falsi ◽  
...  
Keyword(s):  
Electric Field ◽  
Visible Light ◽  
Room Temperature ◽  
Negative Refraction ◽  
Photonic Devices ◽  
Layered Systems ◽  
Electro Optic ◽  
Matter Interaction ◽  
Resonant Systems ◽  
Light Matter Interaction

AbstractA hyperbolic medium will transfer super-resolved optical waveforms with no distortion, support negative refraction, superlensing, and harbor nontrivial topological photonic phases. Evidence of hyperbolic effects is found in periodic and resonant systems for weakly diffracting beams, in metasurfaces, and even naturally in layered systems. At present, an actual hyperbolic propagation requires the use of metamaterials, a solution that is accompanied by constraints on wavelength, geometry, and considerable losses. We show how nonlinearity can transform a bulk KTN perovskite into a broadband 3D hyperbolic substance for visible light, manifesting negative refraction and superlensing at room-temperature. The phenomenon is a consequence of giant electro-optic response to the electric field generated by the thermal diffusion of photogenerated charges. Results open new scenarios in the exploration of enhanced light-matter interaction and in the design of broadband photonic devices.

scholarly journals Optical switching of topological phase in a perovskite polariton lattice

2021 ◽  
Vol 7 (21) ◽  
pp. eabf8049
Author(s):  
Rui Su ◽  
Sanjib Ghosh ◽  
Timothy C. H. Liew ◽  
Qihua Xiong
Keyword(s):  
Optical Switching ◽  
Room Temperature ◽  
Optical Pumping ◽  
Optical Nonlinearity ◽  
Edge States ◽  
Ambient Conditions ◽  
Strong Light ◽  
Exciton Polaritons ◽  
Matter Interaction ◽  
Light Matter Interaction

Strong light-matter interaction enriches topological photonics by dressing light with matter, which provides the possibility to realize active nonlinear topological devices with immunity to defects. Topological exciton polaritons—half-light, half-matter quasiparticles with giant optical nonlinearity—represent a unique platform for active topological photonics. Previous demonstrations of exciton polariton topological insulators demand cryogenic temperatures, and their topological properties are usually fixed. Here, we experimentally demonstrate a room temperature exciton polariton topological insulator in a perovskite zigzag lattice. Polarization serves as a degree of freedom to switch between distinct topological phases, and the topologically nontrivial polariton edge states persist in the presence of onsite energy perturbations, showing strong immunity to disorder. We further demonstrate exciton polariton condensation into the topological edge states under optical pumping. These results provide an ideal platform for realizing active topological polaritonic devices working at ambient conditions, which can find important applications in topological lasers, optical modulation, and switching.

Poled Polyimides for Thermally Stable Electro-Optic Materials

1992 ◽  
Vol 247 ◽  
Author(s):  
J. W. Wu ◽  
J. F. Valley ◽  
M. Stiller ◽  
S. Ermer ◽  
E. S. Binkley ◽  
...  
Keyword(s):  
Electric Field ◽  
Nonlinear Optical ◽  
Room Temperature ◽  
Curing Process ◽  
Thermally Stable ◽  
Excellent Thermal Stability ◽  
Electro Optic ◽  
Poling Temperature ◽  
Electric Field Poling ◽  
Thermal Stability Of

ABSTRACTUsing polyimide as host in a guest-host electro-optic (EO) thin film a thermally stable poled electro-optic response is demonstrated at temperatures at 150 °C and 300 °C. Electric field poling during curing process including imidization (170 -230 °C) and densification (340 -380 °C) accounts for the highly thermally stable EO response. As a room temperature curing process, chemical imidization is employed as a novel curing process. Dehydration occurring through imidization of the polyamic acid is completed chemically after poling rather than thermally during poling. After thermal aging at 155 °C (above the poling temperature) chemically imidized samples retain over 30% of their original poling induced EO signal while similarly poled samples, which have not been chemically imidized, produce a null EO response. For a class of polyimides possessing aliphatic structure, the thermoplastic behavior of cured guest-host polyimide system allowed the electric field poling at temperatures above the glass transition temperature (Tg). One example of polyimide doped with 10% nonlinear optical molecules exhibits Tg near 200 °C, leading to an excellent thermal stability of the poled EO response with a depoling knee-temperature of 150°C.

Pulse shape analysis resolves room temperature coherent light-matter interaction in quantum dots

2013 ◽  
Author(s):  
Mirco Kolarczik ◽  
Nina Owschimikow ◽  
Yücel I. Kaptan ◽  
Ulrike Woggon ◽  
Julian Korn ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Shape Analysis ◽  
Pulse Shape ◽  
Room Temperature ◽  
Coherent Light ◽  
Pulse Shape Analysis ◽  
Matter Interaction ◽  
Light Matter Interaction

Room-Temperature Strong Light–Matter Interaction with Active Control in Single Plasmonic Nanorod Coupled with Two-Dimensional Atomic Crystals

Nano Letters ◽  
2017 ◽  
Vol 17 (8) ◽  
pp. 4689-4697 ◽  
Author(s):  
Jinxiu Wen ◽  
Hao Wang ◽  
Weiliang Wang ◽  
Zexiang Deng ◽  
Chao Zhuang ◽  
...  
Keyword(s):  
Active Control ◽  
Room Temperature ◽  
Two Dimensional ◽  
Strong Light ◽  
Matter Interaction ◽  
Light Matter Interaction

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 Hybrid Confinement of Visible Light in a Nanophotonic Resonator

2021 ◽  
Vol 255 ◽  
pp. 04003
Author(s):  
Tommaso Perani ◽  
Marco Liscidini
Keyword(s):  
Visible Light ◽  
Total Internal Reflection ◽  
Photonic Band Gap ◽  
Light Confinement ◽  
Hybrid Mechanism ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
Visible Wavelengths ◽  
Photonic Band ◽  
Sub Wavelength

We report on the design of a novel nanoresonator operating at visible wavelengths, in which light confinement is achieved by a hybrid mechanism based on total internal reflection and photonic band gap. We show that this structure can support resonant nanophotonic modes with mode volumes on the order of one cubic wavelength, and Q factors exceeding several tens of thousands. Its properties make it ideal for controlling and enhancing the light-matter interaction at sub-wavelength scales.

Enhanced Photocatalytic Performance of Heterojunction BiOI/BiOIO3 Nanocomposites Under Simulated Solar Light

NANO ◽  
2017 ◽  
Vol 12 (03) ◽  
pp. 1750027 ◽  
Author(s):  
Yi Ling Qi ◽  
Xu Chun Song ◽  
Yi Fan Zheng
Keyword(s):  
Photocatalytic Activity ◽  
Electric Field ◽  
Visible Light ◽  
Rhodamine B ◽  
Room Temperature ◽  
Photocatalytic Performance ◽  
Deposition Method ◽  
Simulated Solar Light ◽  
Photogenerated Electrons ◽  
Light Absorber

Novel heterostructure BiOI/BiOIO3 nanocomposites were successfully prepared through a facile deposition method at room temperature. BiOIO3 is a noncentrosymmetric compound that has an internal self-built electric field. BiOI was applied as a visible light absorber to sensitize semiconductors owing to its smallest bandgap. The coupling between BiOIO3 and BiOI can combine their advantages and improve photocatalytic properties. Compared with the single BiOI and BiOIO3, the heterostructure BiOI/BiOIO3 nanocomposites displayed a significantly enhanced photocatalytic activity for the Rhodamine B (RhB) degradation. The enhanced photocatalytic performance is deduced closely related to the formation of BiOI/BiOIO3 heterojunction interface whose presence is regarded to be a favorable factor for the transfer and separation of the photogenerated electrons and holes.

scholarly journals Tailoring the spatial localization of bound state in the continuum in plasmonic-dielectric hybrid system

Nanophotonics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 133-142 ◽  
Author(s):  
Jin Xiang ◽  
Yi Xu ◽  
Jing-Dong Chen ◽  
Sheng Lan
Keyword(s):  
Electric Field ◽  
Life Time ◽  
Dielectric Structure ◽  
Optical Mode ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
Dielectric Nanoparticle ◽  
Symmetry Protected ◽  
Mode Volume ◽  
The Continuum

AbstractBound states in the continuum (BIC) are considered as an effective means to dramatically elongate the trapping time of light. However, light-matter interaction depends not only on the life-time of an optical mode, but also on its mode volume. Therefore, increasing the life-time of an optical mode and minimizing the mode volume simultaneously, utilizing the BIC resembles a promising way for enhancing light-matter interaction. Herein, we have proposed a novel hybrid plasmonic-dielectric structure to manipulate the mode volume of BIC. For the Friedrich-Wintgen BIC, the electric field is strongly confined in the dielectric nanoparticle, leading to the considerable field enhancement compared with the single dielectric nanoparticle case. In contrast, strong localization of electric field can be achieved along the surface normal direction for the symmetry-protected BIC, leading to one order of magnitude reduction of mode volume in one unit cell compared with the conventional symmetry-protected BIC of all-dielectric structure. The proposed hybrid photonic system could provide an ideal flat platform for advanced manipulation of light-matter interaction.

Control of Strong Light–Matter Interaction in Monolayer WS2 through Electric Field Gating

Nano Letters ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 6455-6460 ◽  
Author(s):  
Biswanath Chakraborty ◽  
Jie Gu ◽  
Zheng Sun ◽  
Mandeep Khatoniar ◽  
Rezlind Bushati ◽  
...  
Keyword(s):  
Electric Field ◽  
Strong Light ◽  
Matter Interaction ◽  
Light Matter Interaction

scholarly journals Design of a Low Power Hybrid Electro-Optic Plasmonic Modulator Based on ITO and Graphene

2021 ◽  
Author(s):  
Omid Abbaszadeh-Azar ◽  
Kambiz Abedi
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Extinction Ratio ◽  
Fdtd Method ◽  
Silicon On Insulator ◽  
Operating Voltage ◽  
Electro Optic ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
The Time Domain

Abstract In this paper, a hybrid plasmonic modulator based on ITO and graphene has been proposed and designed. Graphene and ITO are used in the active region, which increases the light-matter interaction and reduces the device's operating voltage in the proposed modulator. As a result, it increases the extinction ratio (ER), reduces power consumption and device footprint in the proposed modulator compared to similar modulators. The values of 14 dB/µm and 5.4 fJ are obtained for ER and power consumption, respectively. The time-domain finite-difference (FDTD) method is used to simulate the modulator. The integration of a modulator with high light-matter interaction and low power consumption in the silicon-on-insulator platform has significant potential for broadband, compact and efficient communication interconnects and circuits.

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