3 ms·

Researchers create dispersion-assisted photodetector to decipher high-dim light

9 points by westurner 2y ago

westurner 2y ago
From "Physicists use [Huygens' mechanical oscillation] 350-year-old theorem to reveal new properties of light waves" https://news.ycombinator.com/item?id=37226160 https://news.ycombinator.com/item?id=37226160 regarding "Bridging coherence optics and classical mechanics: A generic light polarization-entanglement complementary relation" (2023) https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.5.033110 https://journals.aps.org/prresearch/abstract/10.1103/PhysRev... : >> This means that hard-to-measure optical properties such as amplitudes, phases and correlations—perhaps even these of quantum wave systems—can be deduced from something a lot easier to measure: light intensity. Which contradicts the article; though, high-fidelity polarization measurement should then also be useful.
- westurner 2y ago
  See also; "All-optical complex field imaging using diffractive processors" (2024) https://news.ycombinator.com/item?id=40541785 https://news.ycombinator.com/item?id=40541785
- westurner 2y ago
  In an optical (photonic) system, polarization is the phase of photon particles and it is expressed as an angular quantity in radians or degrees. Angular quantities "wrap around" such that `divmod(angle_theta, 2*pi) == n_rotations, angular displacement from zero`; and IIRC all phase spaces must too? Optical phase space: https://en.wikipedia.org/wiki/Optical_phase_space https://en.wikipedia.org/wiki/Optical_phase_space If it is possible to estimate photonic phase given intensity, how much more useful is a phase sensor than the existing intensity sensors? From "Bridging coherence optics and classical mechanics: A generic light polarization-entanglement complementary relation": > A generic complementary identity relation is obtained for arbitrary light fields. More surprisingly, through the barycentric coordinate system, optical polarization, entanglement, and their identity relation are shown to be quantitatively associated with the mechanical concepts of center of mass and moment of inertia via the Huygens-Steiner theorem for rigid body rotation. The obtained result bridges coherence wave optics and classical mechanics through the two theories of Huygens. There are various patterns of polarization, relative to a signal origin IIUC: Polarization (waves) https://en.wikipedia.org/wiki/Polarization_(waves) https://en.wikipedia.org/wiki/Polarization_(waves) Types of polarization: Linear, Elliptical, and Circular; and also Radial and Azimuthal polarization Radial polarization: https://en.wikipedia.org/wiki/Radial_polarization https://en.wikipedia.org/wiki/Radial_polarization : > Beams with radial and azimuthal polarization are included in the class of cylindrical vector beams. [7] > A radially polarized beam can be used to produce a smaller focused spot than a more conventional linearly or circularly polarized beam, [8] and has uses in optical trapping. [9] > It has been shown that a radially polarized beam can be used to increase the information capacity of free space optical communication via mode division multiplexing, [10] and radial polarization can "self-heal" when obstructed. [11] Vector fields in cylindrical and spherical coordinates: Todo Laser beam profiler: https://en.wikipedia.org/wiki/Laser_beam_profiler https://en.wikipedia.org/wiki/Laser_beam_profiler Gaussian beam ... Quasioptics || Geometrical optics with rays and arcs: https://en.wikipedia.org/wiki/Gaussian_beam https://en.wikipedia.org/wiki/Gaussian_beam : > Fundamentally, the Gaussian is a solution of the axial Helmholtz equation, the wave equation for an electromagnetic field. Although there exist other solutions, the Gaussian families of solutions are useful for problems involving compact beams. Photonic integrated circuit: https://en.wikipedia.org/wiki/Photonic_integrated_circuit https://en.wikipedia.org/wiki/Photonic_integrated_circuit : > A photonic integrated circuit (PIC) or integrated optical circuit is a microchip containing two or more photonic components that form a functioning circuit. This technology detects, generates, transports, and processes light. Photonic integrated circuits utilize photons (or particles of light) as opposed to electrons that are utilized by electronic integrated circuits.
  - westurner 2y ago
    > Types of polarization: Linear, Elliptical, and Circular; and also Radial and Azimuthal polarization From https://news.ycombinator.com/item?id=39132365 https://news.ycombinator.com/item?id=39132365 : > Astrophysical jets produce helically and circularly-polarized emissions, too FWIU.

9 points by westurner 2y ago

From "Physicists use [Huygens' mechanical oscillation] 350-year-old theorem to reveal new properties of light waves" https://news.ycombinator.com/item?id=37226160 https://news.ycombinator.com/item?id=37226160 regarding "Bridging coherence optics and classical mechanics: A generic light polarization-entanglement complementary relation" (2023) https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.5.033110 https://journals.aps.org/prresearch/abstract/10.1103/PhysRev... : >> This means that hard-to-measure optical properties such as amplitudes, phases and correlations—perhaps even these of quantum wave systems—can be deduced from something a lot easier to measure: light intensity. Which contradicts the article; though, high-fidelity polarization measurement should then also be useful.

westurner 2y ago
See also; "All-optical complex field imaging using diffractive processors" (2024) https://news.ycombinator.com/item?id=40541785 https://news.ycombinator.com/item?id=40541785
westurner 2y ago
In an optical (photonic) system, polarization is the phase of photon particles and it is expressed as an angular quantity in radians or degrees. Angular quantities "wrap around" such that `divmod(angle_theta, 2*pi) == n_rotations, angular displacement from zero`; and IIRC all phase spaces must too? Optical phase space: https://en.wikipedia.org/wiki/Optical_phase_space https://en.wikipedia.org/wiki/Optical_phase_space If it is possible to estimate photonic phase given intensity, how much more useful is a phase sensor than the existing intensity sensors? From "Bridging coherence optics and classical mechanics: A generic light polarization-entanglement complementary relation": > A generic complementary identity relation is obtained for arbitrary light fields. More surprisingly, through the barycentric coordinate system, optical polarization, entanglement, and their identity relation are shown to be quantitatively associated with the mechanical concepts of center of mass and moment of inertia via the Huygens-Steiner theorem for rigid body rotation. The obtained result bridges coherence wave optics and classical mechanics through the two theories of Huygens. There are various patterns of polarization, relative to a signal origin IIUC: Polarization (waves) https://en.wikipedia.org/wiki/Polarization_(waves) https://en.wikipedia.org/wiki/Polarization_(waves) Types of polarization: Linear, Elliptical, and Circular; and also Radial and Azimuthal polarization Radial polarization: https://en.wikipedia.org/wiki/Radial_polarization https://en.wikipedia.org/wiki/Radial_polarization : > Beams with radial and azimuthal polarization are included in the class of cylindrical vector beams. [7] > A radially polarized beam can be used to produce a smaller focused spot than a more conventional linearly or circularly polarized beam, [8] and has uses in optical trapping. [9] > It has been shown that a radially polarized beam can be used to increase the information capacity of free space optical communication via mode division multiplexing, [10] and radial polarization can "self-heal" when obstructed. [11] Vector fields in cylindrical and spherical coordinates: Todo Laser beam profiler: https://en.wikipedia.org/wiki/Laser_beam_profiler https://en.wikipedia.org/wiki/Laser_beam_profiler Gaussian beam ... Quasioptics || Geometrical optics with rays and arcs: https://en.wikipedia.org/wiki/Gaussian_beam https://en.wikipedia.org/wiki/Gaussian_beam : > Fundamentally, the Gaussian is a solution of the axial Helmholtz equation, the wave equation for an electromagnetic field. Although there exist other solutions, the Gaussian families of solutions are useful for problems involving compact beams. Photonic integrated circuit: https://en.wikipedia.org/wiki/Photonic_integrated_circuit https://en.wikipedia.org/wiki/Photonic_integrated_circuit : > A photonic integrated circuit (PIC) or integrated optical circuit is a microchip containing two or more photonic components that form a functioning circuit. This technology detects, generates, transports, and processes light. Photonic integrated circuits utilize photons (or particles of light) as opposed to electrons that are utilized by electronic integrated circuits.
- westurner 2y ago
  > Types of polarization: Linear, Elliptical, and Circular; and also Radial and Azimuthal polarization From https://news.ycombinator.com/item?id=39132365 https://news.ycombinator.com/item?id=39132365 : > Astrophysical jets produce helically and circularly-polarized emissions, too FWIU.