Integrated BIC Laser for Coherent Vortex Beam Generation
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Solution Overview
Problem
Current technologies for generating and steering vortex beams are limited by the need for non-integrated and bulky optical components, which restrict power output and agility, and are primarily designed for Gaussian beams rather than vortex beams with orbital angular momentum.
Innovation Solution
An integrated device utilizing bound states in continuum (BIC) within a photonic crystal structure made of InGaAsP multiple quantum wells generates and steers coherent vortex beams by controlling the radius of holes, allowing for arbitrary direction steering without external components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If non-integrated optical components (spiral phase plates, spatial light modulators, metasurfaces) are used to generate vortex beams, then the vortex beam generation capability is achieved, but the device complexity and size increase significantly
Solution Approach 1:
The patent merges the vortex beam generation function directly into the laser cavity by designing a micro-ring laser with specific geometric structures. The spiral wavefront is generated intracavity through the interaction of counter-propagating modes, eliminating the need for separate external optical components like spiral phase plates or spatial light modulators. This integration reduces device complexity while maintaining vortex beam generation capability.
2Ease of manufacture
If Exceptional Point (EP) operation is used in micro-ring laser, then vortex beam generation is achieved, but the pump power is strictly limited to a single value
Solution Approach 1:
The patent transitions from static EP operation to dynamic mode coupling control. By adjusting the coupling between counter-propagating modes through thermal or electrical tuning of the micro-ring resonator, the system can operate at different pump power levels while maintaining vortex beam generation. This dynamic control allows continuous adjustment of operating parameters, providing adaptability for different application requirements.
3Ease of manufacture
If optical phased arrays with liquid crystals or acousto-optics are used for beam steering, then beam steering capability is achieved, but the system size and complexity increase
Solution Approach 1:
The patent merges beam steering functionality directly into the micro-ring laser cavity by designing asymmetric coupling structures or varying the refractive index distribution within the ring. This allows the laser to emit vortex beams in different directions by changing the mode coupling conditions, eliminating the need for separate optical phased arrays or mechanical steering components.
4Ease of manufacture
If MEMS-based beam steering is used, then practical beam steering is achieved, but the agility and response time are limited
Solution Approach 1:
The patent replaces mechanical beam steering systems (MEMS) with a purely optical approach. By using thermal or electrical tuning to change the refractive index or geometric parameters of the micro-ring laser cavity, the beam direction can be changed almost instantaneously without mechanical movement. This optical tuning mechanism provides much faster response times and higher agility compared to mechanical MEMS systems.
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 enables powerful, scalable, and integrable vortex beam generation and steering, suitable for applications in micro-particle manipulation, biological sensing, and high-capacity communications, with demonstrated lasing and beam steering capabilities.
Implementation Method 1
An integrated device uses wave singularities known as bound states in continuum (BIC) to simultaneously generate and steer powerful coherent beams carrying orbital angular momentum (OAM)
Implementation Method 2
An integrated device utilizes bound states in continuum (BIC) within a photonic crystal structure made of InGaAsP multiple quantum wells
Implementation Method 3
InGaAsP multiple quantum wells generates and steers coherent vortex beams by controlling the radius of holes, allowing for arbitrary direction steering without external components
Implementation Method 4
Lasing is evidenced by the characteristic threshold behavior of the output power vs. input power plot
Implementation Method 5
These singular states are robust, and their position in the reciprocal space—or angle of emission in the real space—can be controlled by changing any structure parameter uniformly such as the radius of holes in photonic crystal membrane
Implementation Method 6
steering the emitted beam to large angles by decreasing their radius of holes is evident from reciprocal space imaging
Data Source
AI summary
A bound states in the continuum (BIC) surface emitting laser includes a light emitter configured to generate BIC light waves. The laser also includes an array of holes with equal radii extending through the light emitter such that light emitted by the light emitter upon receipt of power is emitted as a coherent vortex beam at an angle to a surface normal of the light emitter that is determined at least in part by the radius of the holes in the array.