Light Field Modulation Induced by Spherical Inclusion in Fused Silica Subsurface

The effect of defect density on the electric field modulation to incident laser is investigated in this work. Based on the actual defect distribution in fused silica subsurface, the three-dimension grid model of defect sites is constructed firstly. Then, the three-dimension finite-difference time-domain method is developed to solve the Maxwell equations. The electric field intensity in the vicinity of the defect sites located in front subsurface of fused silica is numerically calculated. The relationships between the maximal electric field intensity in fused silica and the geometry of the defect sites are given. The simulated results reveal that the modulation becomes more remarkable with the increase of defects density firstly and then decrease. Besides, the effect of the distribution mode of defects on modulation is discussed. Meanwhile, the possible physical mechanism is analyzed in detail.

Download Full-text

A High Precision Time Grating Displacement Sensor Based on Temporal and Spatial Modulation of Light-Field

Sensors ◽

10.3390/s20030921 ◽

2020 ◽

Vol 20 (3) ◽

pp. 921 ◽

Cited By ~ 1

Author(s):

Min Fu ◽

Changli Li ◽

Ge Zhu ◽

Hailin Shi ◽

Fan Chen

Keyword(s):

High Precision ◽

Light Field ◽

Light Transmission ◽

Low Cost ◽

Optimization Method ◽

Spatial Modulation ◽

Displacement Sensor ◽

High Precision Measurement ◽

Object Movement ◽

Field Modulation

A new displacement sensor with light-field modulation, named as time grating, was proposed in this study. The purpose of this study was to reduce the reliance on high-precision measurements on high-precision manufacturing. The proposed sensor uses a light source to produce an alternative light-field simultaneously for four groups of sinusoidal light transmission surfaces. Using the four orthogonally alternative light-fields as the carrier to synthesize a traveling wave signal which makes the object movement in the spatial proportion to the signal phase shift in the time, the moving displacement of the object can be measured by counting time pulses. The influence of the light-field distribution on sensor measurement error was analyzed in detail. Aimed to reduce these influences, an optimization method that used continuous cosinusoidal light transmission surfaces with spatially symmetrical distribution was proposed, and the effectiveness of this method was verified with simulations and experiments. Experimental results demonstrated that the measurement accuracy reached 0.64 μm, within the range of 500 mm, with 0.6 mm pitch. Therefore, the light-field time grating can achieve high precision measurement with a low cost and submillimeter period sensing unit.

Download Full-text

Three-dimensional numerical simulation of light field modulation in the vicinity of inclusions in silica subsurface

Acta Physica Sinica ◽

10.7498/aps.60.044206 ◽

2011 ◽

Vol 60 (4) ◽

pp. 044206

Author(s):

Hua Jin-Rong ◽

Li Li ◽

Xiang Xia ◽

Zu Xiao-Tao

Keyword(s):

Numerical Simulation ◽

Light Field ◽

Three Dimensional ◽

Field Modulation

Download Full-text

Research on the Influence of Metamaterials on Single Photon LiDAR

Frontiers in Physics ◽

10.3389/fphy.2020.585881 ◽

2020 ◽

Vol 8 ◽

Author(s):

Yingying Hu ◽

Duoduo Xu ◽

Zehui Zhou ◽

Tianqi Zhao ◽

Yan Shi ◽

...

Keyword(s):

Light Field ◽

Small Volume ◽

Single Photon ◽

Rapid Development ◽

Chemical Warfare Agent ◽

Lidar System ◽

Photon Detectors ◽

The Core ◽

Single Photon Detectors ◽

Field Modulation

Single photon light detection and ranging (LiDAR) has the advantages of high angle and distance resolution, great concealment, a strong anti-active jamming capability, small volume, and light mass, and has been widely applied in marine reconnaissance, obstacle avoidance, chemical warfare agent detection, and navigation. With the rapid development of metamaterials, the performance of a single photon LiDAR system would be improved by optimizing the core devices in the system. In this paper, we first analyzed the performance index of the single photon LiDAR and discovered the potential of metamaterials in improving the system performance. Then, the influence of metamaterials on the core devices of the single photon LiDAR were discussed, including lasers, scanning devices, optical lenses, and single photon detectors. As a result, we have concluded that through effective light field modulation, metamaterial technology might enhance the performance innovation of the single photon LiDAR.

Download Full-text