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NANOSCALE PROPERTIES. “As soon as the meta-atoms are usually sufficiently smaller than the wavelength, the scattered field can be well described by only the electric (ED) and magnetic (MD) dipoles that makes it extremely helpful to interpret and predict the optical properties of single meta-atoms and their ensembles.” https://lnkd.in/e5fJZNfb View in LinkedIn

MAGNETIC POLARIZATION. “In the scattered field domain, the meta-atoms can be considered as effective point scatterers with specific polarizabilities corresponding to its dominant multipole moments.” https://lnkd.in/e5fJZNfb View in LinkedIn

DEFINITION. “Multipole moments are the coefficients of a series expansion of a potential due to continuous or discrete sources (e.g., an electric charge distribution). All atoms and molecules (except S-state atoms) have one or more non-vanishing permanent multipole moments.” https://lnkd.in/eZKMH75i View in LinkedIn

PHOTONS + META-ATOMS. “One of the most powerful tool for such an analysis is the multipolar expansion method. Within this method, the electromagnetic field inside and outside the scatterer of an arbitrary shape is described by a superposition of vector spherical harmonics (VSHs) forming a complete set of basis functions known as multipoles.” https://lnkd.in/e5fJZNfb View in LinkedIn

DEFINITION. “Metamaterials are artificial structures with unusual and superior properties that come from their carefully designed building blocks -- also called meta-atoms.” (Programmable matter). https://lnkd.in/eD7iFAGi View in LinkedIn

THE NEED. “The accurate description of light interaction with individual meta-atoms and their small clusters is of high interest to the nanophotonics community as it opens a way for effective engineering the nanophotonic structures with predesigned optical properties.” https://lnkd.in/e5fJZNfb View in LinkedIn

SO ENDS this first of two weekends on a consideration of some of Bohr’s ideas about quantum reality. It has been over 100 years since these ideas were introduced, and humanity is still struggling over them. “Opposites are not contradictory but complementary.” (Bohr) sums up how we humans have such deeply embedded and inflexible frames of reference that make understanding the quantum world so difficult. https://lnkd.in/eauD5rnp View in LinkedIn

MEASUREMENT. “Bohr’s view of quantum mechanics has traditionally been seen as opposed to quantum fundamentalism, not least because he insisted on a classical (not quantum) description of the measurement apparatus. This amounts to dissolving the measurement problem from the outset, since the apparatus and its pointer should not be thought of as being in quantum superpositions.” https://lnkd.in/eauD5rnp View in LinkedIn

TWO WORLDS. “Classical physics is causal; complete knowledge of the past allows computation of the future. Likewise, complete knowledge of the future allows precise computation of the past. Not so in quantum physics. Objects in quantum physics are neither particles nor waves; they are a strange combination of both. Given complete knowledge of the past, we can make only probabilistic predictions of the future.” https://lnkd.in/ebDJ4MfS View in LinkedIn

MICRO TO MACRO. “But if everything is quantum then superpositions at the microscopic level become “amplified” to the macro level, and there should thus, for instance, be apparatus pointers in various positions at the same time. Clearly this contradicts ordinary experience.” https://lnkd.in/eauD5rnp View in LinkedIn