Session Index

The development of metamaterials has led to demonstrations of fascinating optical properties such as negative refraction, invisibility, ultra-thin lenses and many more. However, the unique properties of metamaterials are usually fixed and narrowband. Here we develop nano-optomechanical metamaterials that offer a flexible platform for static and fast dynamic control of metamaterial optical properties using electrostatic, magnetic, optical forces and ultrasound.

 

In this work, we demonstrated a localized surface plasmon resonance (LSPPR) Sensor on flexible polydimethylsiloxane (PDMS) substrate with Metal-Insulator-Metal (MIM) disks structure. The flexible LSPR sensor owns high sensitivity ~1500 nm/RIU and stable variation of sensitivity less than 3.5 % under different curvature.

 

We observed a dramatic enhancement of SHG in monolayer WS2 when it is coupled with a plasmonic metasurface whose plasmonic resonance wavelength is in resonance with the excitonic resonance of monolayer WS2. The conversion efficiency of ~2×10-5 is obtained from this hybrid structure.

 

Graphene/metal heterojunctions have been widely studied in charge transfer and n- or p-type doping of graphene-metal hybrid structure. Surface plasmon polaritons (SPPs) could be excited by the slit on metal film then propagate on the surface. In this study, group velocity modulating of SPPs with and without graphene is demonstrated.

 

Using the photonic crystal structure embedded in GaN based LEDs is the way to improve the performance of the devices. The experiments reveal the bandwidth of the LEDs can be improved with photonic crystal structure, and PhCLEDs shown a great potential in visible light communication system.

 

By applying a voltage, the bandedge laser can switch between the short wavelength edges and long wavelength edges without adjusting the band gap. Moreover, adding polymer to stabilize the chiral nematic liquid crystal laser to observe better lasing performance and retain the ability to switch dynamic modes.