Inverse design of a binary waveguide crossing by the particle swarm optimization algorithm

Towards Perfect Ultra-Broadband Absorbers, Ultra-Narrow Waveguides, and Ultra-Small Cavities at Optical Frequencies

“…Fabrication imperfections are categorized as position and radius disorderings. By introducing x i = x i 0 + σ p U x and y i = y i 0 + σ p U y as the position of a rod, the position disordering parameter is introduced as η p = σ p a , where (x i 0 , y i 0 ) is the origin position, σp is the strength of disordering, a is the lattice constant, and U i (i : x, y) is a random variable over an interval [−1, 1] [ [36][37][38][39]. For the radius disordering, the radius of a rod is R i = R 0 i + σ r U r , where R 0 i is the origin position of the rod, σ r is the strength of the radius disordering, and U r is a random variable over the interval [−1, 1].…”

“…Reducing the size of MPHCs for subwavelength operation (corresponding to the visible and UV spectra) brings a new challenge of fabrication imperfections [2,5,7,8,13,15,35] for optical components, such as absorbers, waveguides, and cavities. The imperfections appear as position and radius disorderings that influence the functionality of the structures [13,15,[36][37][38]. As a result, designing ultra-broadband absorbers for UV and visible light, ultra-narrow and highly efficient waveguides for visible light, and ultra-small and high-quality-factor cavities for visible light that tolerate fabrication imperfections is of great importance.…”

Improving transmission of partial parabolic single layer crossing for silicon-on-insulator nanophotonic waveguides by composite subwavelength structures

“…ML is computationally resource-intensive and timeconsuming. 43 GA may have the problem of causing the solution to be stuck at a local maximum and need sophisticated modifications that vary for each application. 44 In general, PSO is a robust algorithm that can prevent the solution from becoming stuck at a local maximum and obtain a global optimal solution.…”

“…There are many optimization methods, including machine learning (ML), 41 genetic algorithms (GA), 42 PSO method, etc. ML is computationally resource-intensive and time-consuming 43 . GA may have the problem of causing the solution to be stuck at a local maximum and need sophisticated modifications that vary for each application 44 .…”

High-Speed Photonic Decoder Employing Two-Dimensional Photonic Crystals

“…Due to the periodic nature of PCs, they exhibit PBGs in all directions, acting as ideal mirrors for incident light waves. This property holds potential applications in different fileds suchas lasers [2], filters [3,4], optical waveguides [5][6][7][8][9], optical fibers [10][11][12], all-optical logic gates [12][13][14][15][16], biosensors [17][18][19], splitters [20,21], imaging [22] and all-optical analog to digital converters [23,24]. Also, PCs photonic crystals have found a highly practical application in the field of all-optical logic gates, garnering substantial attention because of their versatility in various all-optical signal processing applications.…”