Nanostructured surfaces with designed optical functionalities, such as metasurfaces, allow
efficient harvesting of light at the nanoscale, enhancing light–matter interactions for a wide …

Upconversion photoluminescence is a nonlinear effect where multiple lower energy
excitation photons produce higher energy emission photons. This fundamentally interesting …

The near‐infrared (NIR) region of the spectrum is called the “therapeutic window” because
NIR light can penetrate deeply into tissue. Therefore, NIR‐sensitive materials are attractive …

The optically generated collective electron density waves on metal–dielectric boundaries
known as surface plasmons have been of great scientific interest since their discovery …

The enhanced local electromagnetic field (EM) excited on the noble metallic nanostructure
exhibits potential application in various areas, particularly in surface-enhanced …

Photoluminescence including fluorescence plays a great role in a wide variety of
applications from biomedical sensing and imaging to optoelectronics. Therefore, the …

Low-energy photons, which are not used by a solar cell, can be converted to higher-energy
photons by photon upconversion. The figure-of-merit of upconvertors, J UC, is given in mA …

Rare earth doped upconversion nanocrystals (RE-UCNCs) have attracted extensive
interests owing to their unique physical properties and great potential applications in bio …

The incorporation of upconversion luminescence (UCL) materials into various plasmonic
structures promotes light–matter interactions in nanophotonic systems. It has been …

White laser covering the visible color spectrum is critical in various applications including
vivid display, holographic imaging, and light-based version of Wi-Fi, but it is still challenging …