Optical Design Based On ENZ Metamaterials And Gratings

Optical nano-antennas based on metamaterials are one of the popular research areas in micro and nano-photonics,with high research value and development potential in the fields of medicine,quantum information,lasers,and optical imaging for communication.Optical nanoantennas can be used for high frequency band transmission,can achieve precise signal localization,have smaller size,and support more efficient communication technologies.Different materials in applications can also provide more possibilities for metamaterial-based optical nanoantennas,such as near-zero dielectric constant materials(Epsilon-near-zero,ENZ).The paper work is mainly based on the optical nanoantennas of near-zero dielectric constant materials(Indium Tin Oxide)and their far-field radiation properties due to multipole coupling:(1)A tunable metamaterial absorber based on an ENZ material with large optical nonlinearity is discussed.It is investigated that the metamaterial can dynamically control its absorption characteristics by varying the incident intensity.The hybrid structure composed of ENZ material and dielectric material can exhibit non-reciprocal properties.By varying the intensity of the incident beam,the absorption of the hybrid structure can be tuned from 50% to90%.The study provides a new method for ultrafast dynamic control of metamaterial absorption,which can be applied to microbolometer,thermal imaging,acquisition,scattering reduction,photoelectric detection and stealth technology.(2)The main design is a hybrid optical antenna based on indium tin oxide(ITO),in which the deflection of the far-field radiation angle is adjusted optically.a hybrid structure antenna of ITO and silicon(Si),which is capable of achieving a deflection angle that varies by 20.5° with the increase of the incident intensity.Finally,an array structure of ITO or ITO-Si hybrid nanodiscs,which enhances unidirectionality,is investigated.The angular beam width α < 8° of the main lobe.This provides a new idea for further research and application of beam steering and optical modulation.(3)The mechanical and optical performance of the sensor was simulated using finite element analysis(FEA)and rigorous coupled wave analysis(RCWA)methods.The results show that the optical accelerometer has an optical sensitivity of 2.21%/μm,a system sensitivity of 424%/g,and a cross-sensitivity of 3.21% over the entire measurement range.In addition,the sensor has a first-order resonant frequency of 35.995 Hz and a linear measurement range of±0.0177 g.Compared with other low-frequency sensors,this sensor has high performance and is suitable for high-tech fields such as inertial navigation guidance systems,space ocean gravity distribution measurement,and artificial intelligence.