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| 1 | On-chip plasmonic spin-Hall nanograting for simultaneously detecting phase and polarization singularities显示文摘Phase and polarization singularities are important degrees of freedom for electromagnetic field manipulation.Detecting these singularities is essential for modern optics,but it is still a challenge,especially in integrated optical systems.In this paper,we propose an on-chip plasmonic spin-Hall nanograting structure that simultaneously detects both the polarization and phase singularities of the incident cylindrical vortex vector beam(CVVB).The nanograting is symmetry-breaking with different periods for the upper and lower parts,which enables the unidirectional excitation of the surface plasmon polariton depending on the topological charge of the incident optical vortex beam.Additionally,spin-Hall meta-slits are integrated onto the grating so that the structure has a chiral response for polarization detection.We demonstrate theoretically and experimentally that the designed structure fully discriminates both the topological charges and polarization states of the incident beam simultaneously.The proposed structure has great potential in compact integrated photonic circuits. | Fu Feng Guangyuan Si Changjun Min Xiaocong Yuan Michael Somekh | 2020 | Light(Science & Applications)2020，9，1： | 11 |
| 2 | Ultrastable embedded surface plasmon confocal interferometry显示文摘As disease diagnosis becomes more sophisticated,there is a requirement to measure small numbers of molecules attached to,for instance,an antibody.This requires a sensor capable not only of high sensitivity but also the ability to make measurements over a highly localized region.In previous publications,we have shown how a modified confocal microscope allows one to make localized surface plasmon(SP)measurements on a scale far smaller than the surface plasmon propagation distance.The present implementation presents a new ultrastable interferometer system,which greatly improves the noise performance.Hitherto,we have used the central part of the back focal plane to form a reference beam with the reradiated surface plasmons.In the current system,we block the central part and use the spatial light modulator to deflect s-polarized light into the pinhole to form an interference signal with the surface plasmons,thus creating an ultrastable interferometer formed with two beams incident at very similar angles.We demonstrate the superior noise performance of the system in hostile environments and examine further adaptations of the system to further enhance noise performance. | Suejit Pechprasarn Bei Zhang Darren Albutt Jing Zhang Michael Somekh | 2014 | Light(Science & Applications)2014，3，1： | 1 |
| 3 | On-chip sorting of orbital angular momentum beams using Bloch surface wave structures显示文摘Owing to their unique optical properties and new degrees of freedom,orbital angular momentum(OAM)beams have been applied in various fields.Detection of the topological charges(TCs)of OAM beams is the key step for their applications.However,on-chip sorting of OAM beams with large TCs still remains a challenge.In this paper,Bloch surface wave(BSW)structures with five semi-ring shaped nanoslits are modeled.A spatial separation of 135 nm on the chip is obtained between two neighboring OAM states.OAM beams with TCs up to 35 can be successfully sorted by the BSW structures,which is much larger than that using metallic structures(only seven).BSW structures exhibit better OAM sorting performances than metallic structures.We systematically show how the lower attenuation of BSW structures leads to far superior separation ability compared to surface plasmons propagating on metallic structures.In addition,sorting of two OAM beams with different TCs simultaneously can be achieved in this way.Our results reveal that BSW structures should be an excellent solution for OAM sorting with large TCs,which is beneficial for applications in integrated on-chip devices and optical communications. | NANNAN LI QI ZOU YIZHI LAN YAQI WANG JUN ZHANG MICHAEL SOMEKH CHANGJUN MIN FU FENG XIAOCONG YUAN | 2023 | Photonics Research2023，11，11： | 0 |
| 4 | Plasmonic response of gold film to potential perturbation显示文摘Gold film (~50 nm) serves as the working electrode to allow the electrochemical process to be monitored using surface plasmon resonance (SPR) technology. The extracted precise value of time resolved SPR signal perturbed by the non-faradic potential was investigated to study the response time of gold film under potential application. A qualitative model of the reflection and transmission spectra of gold film working as the electrochemical interface is presented. The correlation between three parameters, including thickness of gold film, incident angle and wavelength of beam, were analyzed to generate an optimized configuration for gold film to detect potential. These results emphasis the efficiency of SPR technique used as a diagnostic tool for the electrochemical process. | HUANG Yu PITTER Mark C SOMEKH Michael G ZHANG Wei XIE WanYi ZHANG Hua WANG HuanBo FANG ShaoXi | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，8： | 0 |
| 5 | High tolerance detour-phase graphene-oxide flat lens显示文摘Flat lenses thinner than a wavelength promise to replace conventional refractive lenses in miniaturized optical systems.However,Fresnel zone plate flat lens designs require dense annuli,which significantly challenges nanofabrication resolution.Herein,we propose a new implementation of detour phase graphene flat lens with flexible annular number and width.Several graphene metalenses demonstrated that with a flexible selection of the line density and width,the metalenses can achieve the same focal length without significant distortions.This will significantly weaken the requirement of the nanofabrication system which is important for the development of large-scale flat lenses in industry applications. | SHIBIAO WEI GUIYUAN CAO HAN LIN HAORAN MU WENBO LIU XIAOCONG YUAN MICHAEL SOMEKH BAOHUA JIA | 2021 | Photonics Research2021，9，12： | 0 |
| 6 | Exploitation of geometric and propagation phases for spin-dependent rational-multiple complete phase modulation using dielectric metasurfaces显示文摘Metasurfaces have drawn considerable attention in manipulation of electromagnetic waves due to their exotic subwavelength footprints. Regardless of immense progress of polarization-dependent flat optics, the realization of on-device switchable complete phase multiplication is still missing from design multifunctional devices. Here,by combining geometric and propagation phases, a generalized design principle is proposed that can achieve switchable integer or fractional multiple complete phase modulation in transmitted circularly cross-polarized light by switching the handedness of incident polarization. As a proof of concept, two types of spin-dependent bifunctional wavefront manipulating devices, including switchable beam splitter/beam deflector and spinto-orbital angular momentum converter designs are numerically realized. It is believed that the proposed single-cell spin-switchable rational-multiple complete-phase-modulation design principle based on combined propagation and geometric phases has great potential to underpin the development of meta-optics-based multifunctional operations in the field of integrated optics, imaging, and optical communication. | Ata Ur Rahman Khalid Fu FENG Naeem Ullah Xiaocong Yuan Michael Geoffrey Somekh | 2022 | Photonics Research2022，10，4： | 0 |
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