Year: 2022

FEATHERS AND BUTTERFLY WING SCALES, as well as beetle shells, are known for their complex photonics, but their refractive indexes are all positive. Metamaterials do seem to create a negative refractive index that not known in nature, thus far. https://lnkd.in/eRSFeKH View in LinkedIn

GYNOIDS AND DICHROISM. Circular dichroism in natural gyroid chiral materials has been described. These are among the many ways in which photons are manipulated in the natural world. (Section 3.4). https://lnkd.in/esVfatc View in LinkedIn

CLOSE BUT DISTINCT. Circular dichroism and refractive index are very closely related, but distinct, functions of light waves. https://lnkd.in/e9xgZiY View in LinkedIn

BIRDS OF A FEATHER. "Recently, more and more interest has been focused on the chiral metamaterial (CMM) structures due to their attractive EM (optical) properties such as strong optical activity, circular dichroism (CD) and negative refractive index (NRI) from microwave to optical range." https://lnkd.in/ed4yX2s View in LinkedIn

CHIRAL LIGHT. "Circular dichroism (CD) is dichroism involving circularly polarized light, i.e., the differential absorption of left- and right-handed light. Left-hand circular (LHC) and right-hand circular (RHC) polarized light represent two possible spin angular momentum states for a photon, and so circular dichroism is also referred to as dichroism for spin angular momentum." https://lnkd.in/eMeaKxt View in LinkedIn

WING SCALES. "Photonic crystals (PCs) based on the geometry of oriented triply-periodic gyroid surfaces have been found in wing scales of several butterfly species. This consolidated chitin net has been linked to structural color. As we show here, chirality causes circular dichroic effects." https://lnkd.in/e7bW_yP View in LinkedIn

BUTTERFLY WINGS. "Irridescence, Inclination & Circular Dichroism in Gyroid Photonic Crystals. The single gyroid photonic structure, realised as a porous chitin material in the wing-scales of various green butterflies." https://lnkd.in/e_WBY6G View in LinkedIn

CD IN GYROID PHOTONIC CRYSTALS. "Triply-periodic minimal surfaces, like the cubic gyroid, are good candidates for making photonic crystals with full band gaps than can potentially be tuned in the whole visible spectral range by varying the lattice constant and refraction index contrast." https://lnkd.in/e-N4YS6 View in LinkedIn

CD IN GYROID PHOTONIC CRYSTALS. "They specifically confirm by theory that gyroid photonic crystals display circular dichroism." https://lnkd.in/e-N4YS6 View in LinkedIn

SEA MOUSE PHOTONIC CRYSTALS. "When light is incident perpendicular to the axis of a spine the spine exhibits a strong red colouration. For off-axis incidence strong blues and greens may also be seen." https://lnkd.in/eakUxgP View in LinkedIn