CHEAH, Kok Wai - Associate Head, Chair Professor and Dr. Elizabeth Law Endowed Chair in Advanced Materials
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CHEAH, Kok Wai - Dr. Elizabeth Law Endowed Chair in Advanced Materials
B.Sc. Hons, ARCS, M.Sc., DIC, Ph.D., CSci, CPhys. FinstP
Senior Visiting Professor of Fudan University, Shanghai, China
Contact: Rm. OEE803B |
Optical Properties of Plasmonic Devices
Coupling of SPP and F-B Cavity ModesHighly Efficient Green Organic Light-Emitting Devices Based On Intermolecular Exciplex
Figure 2 Transparent OLED
Transparent OLED is developed in IAM of Hong Kong Baptist University. The aim is to develop a new class of transparent cathode that requires no/minimum modification to the OLED device structure. Therefore it can directly replace existing metal cathode with minimum/no change to the OLED emission characteristics. We have achieved more than 35% (45%-25%) average transmission in optical range for the cathode and used a standard OLED structure to demonstrate its performance.
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Giant nonlinear optical activity of achiral origin in planar metasurfaces with quadratic and cubic nonlinearities
We show that the overwhelming contribution to this nonlinear circular dichroism (CD) is of achiral origin. Therefore, our work sheds new light on the origin of the nonlinear CD effect in achiral planar materials. Our study also opens up new routes for designing chip- type bio-sensing platforms, which may allow for highly sensitive detection of bio- and chemical molecules with weak chiroptical response.
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| Figure 1.5 Schematic of nonlinear optical dichroism from Trisceli- and Gammadion-type plasmonic nanostructures with three-(C3) and four-fold(C4) rotational symmetries. |
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| Figure 1.6 Geometry parameters and transmission properties of the plasmonic nanostructures. |
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| Figure 1.7 SHG-CD and THG-CD from the Trisceli- and Gammadion- type plasmonic nanostructures. |