Structured Illumination Microscopy Light Source Using Spatial Light Modulator
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Solution Overview
Problem
Structured illumination microscopy (SIM) requires efficient generation and modulation of coherent light beams to achieve high spatial resolution, but existing systems face challenges in effectively scanning interference patterns without moving the illumination spot or sample, and in managing non-phase shifted light, which affects image quality.
Innovation Solution
An illumination system utilizing a generator spatial light modulator (SLM) and a controller to generate and modulate coherent light beams, introducing phase differences and rotating their orientation to create interference patterns on the sample, while using beam steering to separate and block non-phase shifted light, allowing for efficient scanning without physical movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple collimated laser beams are focused on the back focal plane to create interference patterns, then spatial resolution is improved, but the system complexity and difficulty of scanning without physical movement increases
Solution Approach 1:
The patent replaces mechanical scanning systems with an SLM-based optical system. The SLM modulates the phase of light beams to create and scan interference patterns on the sample without requiring physical movement of the illumination spot or sample, thereby maintaining high spatial resolution while reducing mechanical complexity
Solution Approach 2:
The patent uses the SLM to dynamically change the phase parameter of the light beams. By modulating the phase across different regions of the SLM, the system can generate and scan multiple interference patterns with different orientations and phases, achieving comprehensive sample illumination without mechanical movement
2Reliability
If the illumination light source uses multiple laser beams focused on the back focal plane, then interference pattern quality is improved, but the difficulty of managing and blocking non-phase shifted light increases
Solution Approach 1:
The patent extracts and separates the non-phase shifted light from the modulated light paths using the SLM configuration. By directing only the phase-modulated beams toward the sample and blocking or diverting the unmodulated illumination light, the system maintains high interference pattern quality while simplifying the management of stray light
Solution Approach 2:
The SLM acts as an intermediary element that selectively processes different light paths. It applies phase modulation to specific beams while leaving other light paths unchanged, enabling easy differentiation and management of modulated versus non-modulated light through subsequent optical elements
3Productivity
If the illumination system scans interference patterns without moving the illumination spot or sample, then productivity is improved, but the ease of operation and control increases
Solution Approach 1:
The patent replaces mechanical scanning with optical phase modulation using the SLM. This substitution enables rapid pattern scanning by electronically controlling the SLM phase patterns, significantly improving productivity while the systematic control architecture maintains operational ease through software-driven patterns
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the efficiency of SIM by effectively scanning structured light patterns across the sample through phase and orientation changes, improving image resolution and quality by eliminating unnecessary light, thus overcoming the limitations of prior systems.
Implementation Method 1
a generator spatial light modulator (SLM) positioned to receive an incident light beam and adapted to generate first and second coherent light beams
Implementation Method 2
a modulator SLM that alters the phase of one of the first and second coherent light beams to generate a relative phase difference
Implementation Method 3
two or more different laser beams that interfere at the sample
Implementation Method 4
The first optical system images light leaving the generator SLM on a modulator SLM
Data Source
AI summary
An illumination system and a method for operating an illumination system is disclosed. The illumination system includes a generator spatial light modulator, first and second optical systems and a controller. The generator spatial light modulator is positioned to receive an incident light beam and adapted to generate first and second coherent light beams, each beam being characterized by a phase and a first light beam optical axis in a plane containing the first and second coherent light beams. The first optical system images light leaving the generator spatial light modulator on a modulator spatial light modulator that alters the phase of one of the first and second coherent light beams to generate a relative phase difference. The second optical system that images light leaving the modulator spatial light modulator onto a sample to be illuminated. The controller causes the relative phase difference to cycle through a plurality of different phase-difference values.