Mid-infrared, long-wave infrared, and terahertz photonics: introduction.

This feature issue presents recent progress in long-wavelength photonics, focusing on wavelengths that span the mid-infrared (3-50 µm), the long-wavelength infrared (30-60 µm), and the terahertz (60-300 µm) portions of the electromagnetic spectrum. The papers in this feature issue report recent progress in the generation, manipulation, detection, and use of light across this long-wave region of the "photonics spectrum," including novel sources and cutting edge advances in detectors, long-wavelength non-linear processes, optical metamaterials and metasurfaces, and molecular spectroscopy. The range of topics covered in this feature issue provide an excellent insight into the expanding interest in long-wavelength photonics, which could open new possibilities for basic research and applications in industries that span health, environmental, and security.

[1]  G. Almuneau,et al.  Interband cascade Lasers with AlGaAsSb cladding layers emitting at 3.3 µm. , 2019, Optics express.

[2]  G. Capellini,et al.  Terahertz absorption-saturation and emission from electron-doped germanium quantum wells. , 2020, Optics express.

[3]  M. Shur,et al.  Far-infrared photodetectors based on graphene/black-AsP heterostructures. , 2020, Optics express.

[4]  D. Burghoff,et al.  Sensitivity of SWIFT spectroscopy. , 2020, Optics express.

[5]  J. Talghader,et al.  High-Q diamond microresonators in the long-wave infrared. , 2020, Optics express.

[6]  W. Lu,et al.  Selectively thermal radiation control in long-wavelength infrared with broadband all-dielectric absorber. , 2019, Optics express.

[7]  A. Hatta,et al.  Shape-dependent infrared reflectance properties of CNT forest metamaterial arrays. , 2020, Optics express.

[8]  Ashkin,et al.  Terahertz absorption-saturation and emission from electron-doped germanium quantum wells. , 2020, Optics Express.

[9]  Evan M. Smith,et al.  Angle- and polarization-independent mid-infrared narrowband optical filters using dense arrays of resonant cavities. , 2019, Optics express.

[10]  Yanfeng Li,et al.  Terahertz metamaterial beam splitters based on untraditional coding scheme. , 2019, Optics express.

[11]  Power scaling and spectral linewidth suppression of hybrid Brillouin/thulium fiber laser. , 2020, Optics express.

[12]  V. Mashinsky,et al.  2166 nm all-fiber short-pulsed Raman laser based on germania-core fiber. , 2019, Optics express.

[13]  D. Paul,et al.  Ge-on-Si waveguides for sensing in the molecular fingerprint regime. , 2020, Optics express.

[14]  Yuefeng Ji,et al.  Multi-resonance and ultra-wideband terahertz metasurface absorber based on micro-template-assisted self-assembly method. , 2020, Optics express.