Inverse design of photonic meta-structure for beam collimation in on-chip sensing
| Autor: | Anuradha M. Agarwal, Mingye Gao, Yuqi Nie, Robin Singh, Brian W. Anthony |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Optimal design
Materials science Science Physics::Optics 02 engineering and technology Grating 01 natural sciences Multiplexing Article law.invention 010309 optics Optical physics Planar Optics law 0103 physical sciences Miniaturization Lasers LEDs and light sources Optical materials and structures Optical techniques Multidisciplinary business.industry Collimator 021001 nanoscience & nanotechnology Optics and photonics Other photonics Medicine Photonics 0210 nano-technology business Applied optics Beam (structure) |
| Zdroj: | Scientific Reports, Vol 11, Iss 1, Pp 1-11 (2021) Scientific Reports |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/s41598-021-84841-2 |
| Popis: | Designed or patterned structured surfaces, metasurfaces, enable the miniaturization of complex arrangements of optical elements on a plane. Most of the existing literature focuses on miniaturizing the optical detection; little attention is directed to on-chip optical excitation. In this work, we design a metasurface to create a planar integrated photonic source beam collimator for use in on-chip optofluidic sensing applications. We use an iterative inverse design approach in order to optimize the metasurface to achieve a target performance using gradient descent method. We then fabricate beam collimators and experimentally compare performance characteristics with conventional uniform binary grating-based photonic beam diffractors. The optimal design enhances the illumination power by a factor of 5. The reinforced beam is more uniform with 3 dB beam spot increased almost ~ 3 times for the same device footprint area. The design approach will be useful in on-chip applications of fluorescence imaging, Raman, and IR spectroscopy and will enable better multiplexing of light sources for high throughput biosensing. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink