Zobrazeno 1 - 10
of 562
pro vyhledávání: '"Shinichi, Saito"'
Autor:
Shinichi Saito
Publikováno v:
Heliyon, Vol 10, Iss 14, Pp e34423- (2024)
The coherent state from a laser source has spin and orbital degrees of freedom, which allow an arbitrary superposition state among orthogonal states with varying amplitudes and phases. Here, we theoretically show coherent photons with SU(N) symmetry
Externí odkaz:
https://doaj.org/article/c8db854241e6449cb1df42216e701af7
Autor:
Shinichi Saito
Publikováno v:
Results in Physics, Vol 61, Iss , Pp 107745- (2024)
We show coherent photons with spin and orbital angular momentum have symmetry of special unitary group of degree four, SU(4), both theoretically and experimentally. We show the degree of polarisation could be a measure to characterise the quantum coh
Externí odkaz:
https://doaj.org/article/09e9415d4bf7451d94a030ecc34ed3fe
Autor:
Abdelrahman Z. Al-Attili, Daniel Burt, Tasmiat Rahman, Zuo Li, Naoki Higashitarumizu, Frederic Y. Gardes, Yasuhiko Ishikawa, Shinichi Saito
Publikováno v:
APL Photonics, Vol 9, Iss 5, Pp 056104-056104-10 (2024)
Various excitation-induced loss mechanisms have been identified during the development of direct-gap semiconductor lasers. Recently, indirect-gap laser sources, particularly germanium (Ge) or GeSn based, have emerged due to silicon industry compatibi
Externí odkaz:
https://doaj.org/article/762764da676545229e804b4cd6a210cd
Autor:
Shinichi Saito
Publikováno v:
Heliyon, Vol 10, Iss 7, Pp e28367- (2024)
Spin is a fundamental degree of freedom, which was discovered by Dirac for an electron in his relativistic quantum mechanics, known as the Dirac equation. The origin of spin for a photon is unclear because Maxwell's equations in a vacuum are Lorentz
Externí odkaz:
https://doaj.org/article/e40af1d700394bf1bd9979bc0a77df0c
Autor:
Shinichi Saito
Publikováno v:
Results in Physics, Vol 59, Iss , Pp 107567- (2024)
Polarisation is described by an SU(2) state due to the coherence of photons emitted from a ubiquitous laser source. We propose a polarisation modulator, called as a Poincaré rotator, which enables dynamic control over a polarisation state by executi
Externí odkaz:
https://doaj.org/article/ae4678cd2631462bb6b2b840ec2f9724
Autor:
Shinichi Saito
Publikováno v:
Frontiers in Physics, Vol 11 (2024)
Stokes parameters (S) on the Poincaré sphere are very useful values to describe the polarisation state of photons. However, the fundamental principle on the nature of polarisation is not completely understood, yet, because we have no concrete consen
Externí odkaz:
https://doaj.org/article/872272f79f4442b7aa0cd5d4c2e764ee
Autor:
Shinichi Saito
Publikováno v:
Frontiers in Physics, Vol 11 (2023)
The polarization state is described by a quantum mechanical two-level system, which is known as special unitary group of degree 2 [SU(2)]. Polarization is attributed to an internal spin degree of freedom inherent to photons, while photons also posses
Externí odkaz:
https://doaj.org/article/3976e05570d74bf98bcb2aa2a071c447
Autor:
Shinichi Saito
Publikováno v:
Frontiers in Physics, Vol 11 (2023)
Orbital Angular Momentum (OAM) of photons are ubiquitously used for numerous applications. However, there is a fundamental question whether photonic OAM operators satisfy standard quantum mechanical commutation relationship or not; this also poses a
Externí odkaz:
https://doaj.org/article/813cca4d21cd4462964b151006d39836
Autor:
Shinichi Saito
Publikováno v:
Frontiers in Physics, Vol 11 (2023)
Polarisation states are described by spin expectation values, known as Stokes parameters, the trajectories of which in a rotationally symmetric system form a sphere named after Poincaré. Here, we show that the trajectories of broken rotational symme
Externí odkaz:
https://doaj.org/article/b264bfa8ff2b4b8f8eaf51bd97f98fae
Autor:
Shinichi Saito
Publikováno v:
Frontiers in Physics, Vol 11 (2023)
Twisted photons with finite orbital angular momentum have a distinct mode profile with topological charge at the center of the mode while propagating in a certain direction. Each mode with different topological charges of m is orthogonal, in the sens
Externí odkaz:
https://doaj.org/article/8dbb8fe5f4344a789b210ac27835ed56