Surface plasmon (SP) resonance with light waves and/or excitons can be used to enhance the emission efficiencies of light-emitting materials and devices. This approach was experimentally demonstrated by our group for enhancing the visible emission from InGaN/GaN quantum wells (QWs). Exciton–SP coupling increases the spontaneous emission rates of the excited states, causes a relative reduction in nonradiative relaxation, and ultimately increases the internal quantum efficiencies (IQEs) of such devices. This method has the potential to enable the development of high-efficiency lightemitting diodes (LEDs), eventually leading to the replacement of fluorescent lights with solid-state light sources. Next important challenge is to extend this method into UV and IR wavelength regions. We found that Al is very useful for wider tuning of the plasmonic resonance from the deep UV to the visible wavelength region. The plasmonic tuning at the IR regions were also discussed by using tantalum nanoparticle. These tunable plasmonics over the UV-IR range should bring new possibilities of applications to plasmonics and lead to new class of several smart photonic and optoelectronic applications.
Koichi Okamoto, "Tunable plasmonic resonance in wide wavelength range for smart photonic and optoelectronic applications," Proc. SPIE 10536, Smart Photonic and Optoelectronic Integrated Circuits XX, 105360R (Presented at SPIE OPTO: January 30, 2018; Published: 22 February 2018); https://doi.org/10.1117/12.2290266.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon