Abstract
Quantum correlated imaging using the intensity fluctuations of thermal light possesses advantages of high resolution and strong anti-interference ability. The common method to produce pseudo-thermal light source is using a rotary ground glass and transmission of laser beam. In the present work, we propose a method for the fabrication of microwell arrays with randomly varied diameters, which could be used as a new structural element for pseudo-thermal speckle light source. If these are etched with random sizes then they may also have random and complex varying curvatures (diffusion limited etching) leading to random destructive interference of the coherent beam which could be a good thing. The microwell arrays, with diameters randomly varying from 5 μm to 40 μm, height varying from 200 nm to 20 μm, were fabricated by photolithography combined with acid etching. The experimental conditions are simple and can be scaled up to for large structures. The produced microwell arrays can transform the laser beam to a pseudo-thermal light source with a certain divergent angle by rational designing of mask and adjustable process parameters.
Highlights
Quantum correlated imaging is a new type of imaging using quantum entanglement or intensity fluctuation characteristics of light field [1–4]
We propose the fabrication of microwell arrays with randomly varied diameters as a new structure as pseudo-thermal speckle light source
The microwell array can be fabricated by photolithography combined with acid etching, and the obtained pseudo-thermal source can be generated with a controllable divergent angle
Summary
Quantum correlated imaging is a new type of imaging using quantum entanglement or intensity fluctuation characteristics of light field [1–4]. Further experiments suggested that pseudo-thermal light could be used as a light source to achieve ghost imaging with higher resolution [8–11]. The laser light beam can be modulated by different methods to imitate the thermal light field. The pseudo-thermal light source can be obtained in the far field through coherent superposition, which results in a beam that exhibits fluctuation in space and time. When quantum correlated imaging technology is applied in remote sensing, missile-borne, or satellite-borne remote imaging, higher requirements for the pseudo-thermal light source are needed. These includes small divergence angle of the whole light, no center zero-order point, energy be effectively concentrated in a certain region in long-distance transmission. The microwell array can be fabricated by photolithography combined with acid etching, and the obtained pseudo-thermal source can be generated with a controllable divergent angle
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