Abstract: Embodiments of the present disclosure generally relate to fire-resistant compositions and to coated substrates and articles comprising such compositions. In an embodiment, a fire-resistant composition is provided. The fire-resistant composition includes particles having a core-shell structure. The fire-resistant composition further includes an intumescent, a blowing agent, a catalyst, and a binder. In another embodiment, a coated substrate is provided. The coated substrate includes a substrate having a fire-resistant composition disposed thereon. In another embodiment, a fire-resistant article is provided. The fire-resistant article includes a flexible substrate having a fire-resistant composition disposed thereon.

Abstract: An optical component has a bottom part located in an opening defined by a surface, wherein a distance between a sidewall of the bottom part of the optical component and a sidewall of the opening is non-uniform in which a width of a first section of the opening or a first section of the bottom part of the optical component is narrower than a width of a second lower section of the opening or a width of a second lower section of the bottom part of the optical component; and an adhesive is located in the opening between sidewalls.

Abstract: A heterodyne photomixer spectrometer comprises a receiver photomixer that is driven at a different frequency than the source photomixer, thereby maintaining the coherent nature of the detection, eliminating etalon effects, and providing not only the amplitude but also the phase of the received signal. The heterodyne technique can be applied where the source and receiver elements are components of a waveguide thereby forming an on-chip heterodyne spectrometer.