Enhanced optical squeezing from quasi-bound states in the continuum and Fano resonances without nonlinearity

Zhang, Xiangdong; Li, Zhixin

doi:10.1088/1367-2630/ab5d9f

Cited by 5 publications

(3 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The week measurements can be achieved by metasurface-enabled quantum emitters or quantum resonators. For example, the squeezed state can be manipulated using metasurfaces, , which can be applied to detect weak signals without disturbing the quantum states of observables. Metasurface-assisted coherent perfect absorption can greatly enhance the efficiency of multiphoton processes.…”

Section: Discussionmentioning

confidence: 99%

Metasurface Micro/Nano-Optical Sensors: Principles and Applications

et al. 2022

View full text Add to dashboard Cite

Metasurfaces are 2D artificial materials consisting of arrays of metamolecules, which are exquisitely designed to manipulate light in terms of amplitude, phase, and polarization state with spatial resolutions at the subwavelength scale. Traditional micro/nano-optical sensors (MNOSs) pursue high sensitivity through strongly localized optical fields based on diffractive and refractive optics, microcavities, and interferometers. Although detections of ultra-low concentrations of analytes have already been demonstrated, the label-free sensing and recognition of complex and unknown samples remain challenging, requiring multiple readouts from sensors, e.g., refractive index, absorption/emission spectrum, chirality, etc. Additionally, the reliability of detecting large, inhomogeneous biosamples may be compromised by the limited near-field sensing area from the localization of light. Here, we review recent advances in metasurface-based MNOSs and compare them with counterparts using micro-optics from aspects of physics, working principles, and applications. By virtue of underlying the physics and design flexibilities of metasurfaces, MNOSs have now been endowed with superb performances and advanced functionalities, leading toward highly integrated smart sensing platforms.

show abstract

Section: Discussionmentioning

confidence: 99%

Metasurface Micro/Nano-Optical Sensors: Principles and Applications

et al. 2022

View full text Add to dashboard Cite

show abstract

“…This means that the quasi-BICs manifest themselves as a type of Fano resonance as the structural symmetry is broken [ 40 , 41 ]. It can be seen in Figure 4 a, for a field distribution at 0.484 THz, that the strong field is located at the edge of metal strips, which is sensitive to material changes.…”

Section: Simulation Results and Analysismentioning

confidence: 99%

Double-Strip Array-Based Metasurfaces with BICs for Terahertz Thin Membrane Detection

Shen,

Wang,

Sheng

et al. 2023

Micromachines

View full text Add to dashboard Cite

A double-strip array-based metasurface that supports the sharp quasi-bound states in the continuum (quasi-BICs) is demonstrated in terahertz regions. By tuning the structural parameters of metal strips, the conversion of BICs and quasi-BICs is controllable. The simulated results exhibit an achieved maximum Q-factor for quasi-BICs that exceeds 500, corresponding to a bandwidth that is less than 1 GHz. The optical response of quasi-BICs is mainly affected by the properties of substrates. Resonant frequencies decrease linearly with increasing refractive index. The bandwidth of quasi-BICs decreases to 0.9 GHz when n is 2.2. The sharp quasi-BICs are also sensitive to changes in material absorption. Low-loss materials show higher Q-factors. Thus, the selection of a suitable substrate material will be beneficial in achieving resonance with a high Q value. The sensitivity of DSAs for molecules is assessed using a thin membrane layer. The DSAs show high sensitivity, which achieves a frequency shift of 70 GHz when the thickness of the membrane is 10 μm, corresponding to a sensitivity of 87.5 GHz/RIU. This metasurface with sharp quasi-BICs is expected to perform well in THz sensing.

show abstract

“…Analogous to localized electrons with energies larger than their potential barriers, light BICs, which are also known as embedded trapped modes and correspond to discrete eigenvalues which coexist with the extended modes of a continuous spectrum, have been realized in recent years [47][48][49][50][51][52][53][54][55][56][57][58]. They have been shown to exist in dielectric gratings, waveguide structures, object surfaces, photonic crystal slabs, and some open subwavelength nanostructures [59][60][61][62][63][64][65][66][67][68]. Recently, photonic integrated circuits with BICs have been designed using the LN platform [69,70].…”

Section: Introductionmentioning

confidence: 99%

Highly efficient polarization-entangled photon-pair generation in lithium niobate waveguides based on bound states in continuum

Chen

et al. 2021

Opt. Express

View full text Add to dashboard Cite

Integrated optics provides a platform for the experimental implementation of highly complex and compact circuits for practical applications as well as for advances in the fundamental science of quantum optics. The lithium niobate (LN) waveguide is an important candidate for the construction of integrated optical circuits. Based on the bound state in the continuum (BIC) in a LN waveguide, we propose an efficient way to produce polarizationentangled photon pairs. The implementation of this method is simple and does not require the polarization process needed for periodically poled LN. The generation rate of the entangled photon pairs increases linearly with the length of the waveguide. For visible light, the generation efficiency can be improved by more than five orders of magnitude with waveguides having the length of only a few millimeters, compared with the corresponding case without BICs. The phenomena can appear in a very wide spectrum range from the visible to THz regions.This study is of great significance for the development of active integrated quantum chips in various wavelength ranges.

show abstract

Enhanced optical squeezing from quasi-bound states in the continuum and Fano resonances without nonlinearity

Cited by 5 publications

References 54 publications

Metasurface Micro/Nano-Optical Sensors: Principles and Applications

Metasurface Micro/Nano-Optical Sensors: Principles and Applications

Double-Strip Array-Based Metasurfaces with BICs for Terahertz Thin Membrane Detection

Highly efficient polarization-entangled photon-pair generation in lithium niobate waveguides based on bound states in continuum

Contact Info

Product

Resources

About