… We report on AlGaN grating reflectors for short-wavelength applications, an … reflectors that
are difficult to make in a GaN-based system. An array of air-bridge AlGaN grating reflectors, …

… the short-wavelength region, the GaN surface grating reflectors have been proposed for the
… grating reflectors only reached to 90% [14]. Besides, the AlGaN membrane grating reflectors …

… superlattice to form an AlGaN HCG membrane, 9 however, with … In addition, GaN membrane
gratings have been fabricated … an airgap, a GaN grating reflector without an airgap has been …

… in the 1990s and has evolved from using AlGaN, AlN, to using lattice-matched AlInN … gratings,
physical sensors and manipulation of light in photonic crystals. Distributed Bragg reflectors …

… Optical modes propagate within the freestanding GaN membrane … membrane is reduced.
Backside thinning of freestanding GaN membranes is used to obtain thinner GaN membranes …

… of HCG membranes 10,11 . To date, electrically driven VCSELs with HCG reflectors in the
… In many cases, the top mirror comprises a thin membrane HCG layer combined with a few λ/…

… reported that membrane-type grating reflectors (MGRs) … AlGaN sub-wavelength MGR [4],
which could be a solution circumventing the aforementioned limitations of conventional reflector …

… oxide-based Distributed-Bragg-Reflector (t-DBR) membranes. Unlike the widely used direct
… nitride membrane. It is worth mentioning that the same GaN/AlGaN QW membranes have …

… An HCG comprises one layer of subwavelength gratings that … HCG is in most cases of a
membrane type, that is, suspended … -standing HCG membranes, a grating reflector without an air-…

… GaN membrane thickness, realize unlimited air gap, and eliminate absorption loss by AlGaN…
We demonstrate GaN suspended membrane rib waveguide and gratings for coupling a free-…