Tag: Photonics
Defective atomic lattice enables unidirectional reflection lasing
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in OpticsWhat the study found The study reports a scheme for mode-tunable unidirectional reflection lasing using a coherent gain atomic system and a one-dimensional defective atomic lattice. The authors describe this as a single system that combines nonreciprocity and lasing oscillation. Why the authors say this matters The authors say the approach could improve the efficiency…
Mie void cavities show polaritonic spectra under resonant loading
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in OpticsWhat the study found The study found that spherical Mie void cavities, including the inverse case of a void inside a resonant dispersive medium, can be analyzed for their resonant characteristics and polaritonic spectra. The authors report approximate analytical expressions for the Q-factors of these cavities and identify parameter ranges associated with weak and strong…
Structured light enables control of optical chirality and spin
What the study found A single tunable parameter can link Pancharatnam topology to paraxial spin-orbit coupling, allowing control of optical chirality and spin angular momentum (SAM, the spin part of light’s angular momentum). Why the authors say this matters The authors conclude that this provides a simple and material-independent route to generate and control optical…
Photonic chip synthesizes flexible millimeter-wave signals
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What the study found The study found that a silicon photonic chip paired with a reconfigurable optical frequency comb can synthesize millimeter-wave signals. The system supports on-chip filtering and modulation and can produce single-frequency, multi-frequency, and vector signals for arbitrary IQ signal construction. Why the authors say this matters The authors say photonics-assisted millimeter-wave and…
Modulating unit cells changes topological phases in a photonic Lieb lattice
What the study found The study found that relaxing a specific spatial symmetry of the unit cell in a gyromagnetic photonic crystal can produce a hierarchy of topological phases. These include first-order Chern phases and second-order dipole and quadrupole phases, with both edge states and corner states appearing across different phases. Why the authors say…
PbPc fiber laser produced stable femtosecond pulses and near-infrared supercontinuum
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in OpticsLead phthalocyanine saturable absorber enables stable femtosecond pulse generation in fiber laser and broadband near-infrared supercontinuum synthesis.
Integrated photonic system senses spectrum from microwave to sub-terahertz
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in EngineeringIntegrated photonic spectrum sensing system on lithium niobate platform enables real-time 6G wireless network spectrum management with sub-110ns latency and 120 GHz measurement range.
