Photometric Absorbance Spectrum Analyzer of Slightly Transparent Biomaterials

Optical Complex Spectrum Analyzer

Moth Wing Scales Slightly Increase the Absorbance of Bat Echolocation Calls

Coevolutionary arms races between predators and prey can lead to a diverse range of foraging and defense strategies, such as countermeasures between nocturnal insects and echolocating bats. Here, we show how the fine structure of wing scales may help moths by slightly increasing sound absorbance at frequencies typically used in bat echolocation. Using four widespread species of moths and butter...

Optical Complex Spectrum Analyzer (OCSA)

Perceptual preferences in depth stratification of transparent layers: Photometric and non-photometric factors.

In three experiments, using a two-alternative forced-choice task, we obtained depth judgments of displays containing transparent regions. The regions varied in lightness, size, and animation. Observers nearly always strongly preferred one certain depth ordering among the regions, even though their lightness conditions were expected to give rise to ambiguity among possible orderings. This expect...

Nonlinear single-spin spectrum analyzer.

Qubits have been used as linear spectrum analyzers of their environments. Here we solve the problem of nonlinear spectral analysis, required for discrete noise induced by a strongly coupled environment. Our nonperturbative analytical model shows a nonlinear signal dependence on noise power, resulting in a spectral resolution beyond the Fourier limit as well as frequency mixing. We develop a noi...