Theoretical Design of a Pump‐Free Ultrahigh Efficiency All‐Optical Switching Based on a Defect Ring Optical Waveguide Network

Yang

Physica Status Solidi (b)

et al. 2019

Self Cite

Herein, the optimization of the all-optical switching constructed from photonic bandgap (PBG) network is studied and numerically calculate the switching performance indices using network equation and generalized eigenfunction methods. The optimization of the all-optical switching is discussed in depth from three aspects: the length ratio of waveguide segments, the number of nonlinear material defects, and the difference between the refractive index of the linear and that of the nonlinear material. After optimization, the ultralow threshold control energy/power decreases to 1.12 Â 10 À29 J=8.9 Â 10 À11 GW m À2 , which is eight orders of magnitude smaller than the best reported result. Also, the ultrahigh switching efficiency exceeds 1.04 Â 10 26 , which is 15 orders of magnitude larger than that reported in the previous works. The switching time and feature size can also reach the level of the best reported results. It may provide a new way for the optimization of all-optical switching structure and accelerates the realization of practical all-optical switching.

“…At

n_{0} = 1.63

, the threshold control powers of the channels are

E_{A - 1} \approx 6.4 \times 10^{- 26} J

E_{A - 2} \approx 6.55 \times 10^{- 26} J

E_{B - 1} \approx 3.54 \times 10^{- 26} J

, and

E_{B - 2} \approx 3.81 \times 10^{- 26} J

, respectively. The

E_{Thre}

is significantly reduced, and it is five orders of magnitude larger than the previously reported result …”

Section: Optimizationcontrasting

confidence: 79%

d_{2} : d_{1} = 3 : 1

, and the rate of the length to the upper and lower arms of the intermediate cell is

d_{3} : d_{1} = 2.99 : 1

n_{1}

, is from 1.0 to 8.0 and the refractive index of the nonlinear material, denoted as

n_{0}

, is from 1.45 to 1.63 . To make it convenient for experiment, the working wavelength is set to the communication wavelength

λ_{work} = 1.55 μ m

.…”

Section: Models and Theoretical Methodsmentioning

confidence: 99%

Section: Optimization Of Threshold Control Powermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Optimization of the All‐Optical Switching Constructed from Photonic Bandgap Network

Yang

Physica Status Solidi (b)

et al. 2019

Self Cite

Broadband Radiative Cooling and Decoration for Passively Dissipated Portable Electronic Devices by Aperiodic Photonic Multilayers

Chen

2020

Annalen der Physik

Self Cite

Broadband radiative cooling and decoration for passively dissipated portable electronic devices by an aperiodic photonic multilayer structure is proposed theoretically. The designed optical structure can strongly emit in the infrared region from 6.9 to 40 µm within the blackbody radiation spectrum of electronic devices. Its emission spectrum exhibits good uniformity across different incident angles, enhancing the cooling performance. At an ambient temperature of 20 • C, the designed broadband radiative cooler can produce a net cooling power of 46.88 W m −2 , 65.95% higher than pure silica of the same thickness. At a typical junction temperature of 90 • C allowed by the microprocessor die, the net cooling power reaches 239.55 W m −2 , still with an 18.21% improvement over pure silica glass. In the visible regime, the designed structure displays a low uniformity in the reflection spectrum, producing an elegant color shift from the translucent gray color of normal direction to the silver and highly reflective look at a grazing angle. These results can be useful in future exterior and thermal designs of portable electronic devices.

A Self‐Defocusing Effect in Series of Networks for Nano All‐Optical Switching

Yang

2021

Annalen der Physik

Self Cite

A theoretical design of all‐optical switches based on series of networks (SNs) is proposed. With increment of the fractal generation, the density of loops (d1:d2=1:2) in networks, which can efficiently produce antiresonances, increases exponentially, increasing switching efficiency to a high level. To acquire superior performance of the switching efficiency, the nonlinear material with negative nonlinear refractive index was chosen to insert into the networks, inducing self‐defocusing effect and decreasing the transmission. Further, the SNs with a defective waveguide length create ultra‐strong photonic localization and reduce the threshold energy. The switching efficiency of just the third type of SN was calculated and found to be approximately 5.25 × 1026, which is nine orders of magnitude higher than that previously reported. The threshold energy of just the third type of SN is about 0.66zJ, which is one order of magnitude lower than that reported previously. Moreover, the switching efficiency increases monotonously, and the threshold energy decreases rapidly with increasing fractal generation.