Shanhui Fan, Postdoctoral Faculty Sponsor
- Inverse Design of Metasurfaces Based on Coupled-Mode Theory and Adjoint Optimization ACS PHOTONICS 2021; 8 (8): 2265-2273
- Self-Focused Thermal Emission and Holography Realized by Mesoscopic Thermal Emitters ACS PHOTONICS 2021; 8 (2): 497–504
- Subwavelength angle-sensing photodetectors inspired by internally coupled ears in small animals SPIE-INT SOC OPTICAL ENGINEERING. 2019
- Subwavelength angle-sensing photodetectors inspired by directional hearing in small animals NATURE NANOTECHNOLOGY 2018; 13 (12): 1143-+
- Subwavelength angle-sensing photodetectors inspired by directional hearing in small animals (vol 13, pg 1143, 2018) NATURE NANOTECHNOLOGY 2018; 13 (12): 1191
Author Correction: Subwavelength angle-sensing photodetectors inspired by directional hearing in small animals.
In the version of this Letter originally published, Zongfu Yu was mistakenly not noted as being a corresponding author; this has now been corrected in all versions of the Letter.
View details for PubMedID 30443033
Subwavelength angle-sensing photodetectors inspired by directional hearing in small animals.
Sensing the direction of sounds gives animals clear evolutionary advantage. For large animals, with an ear-to-ear spacing that exceeds audible sound wavelengths, directional sensing is simply accomplished by recognizing the intensity and time differences of a wave impinging on its two ears1. Recent research suggests that in smaller, subwavelength animals, angle sensing can instead rely on a coherent coupling of soundwaves between the two ears2-4. Inspired by this natural design, here we show a subwavelength photodetection pixel that can measure both the intensity and incident angle of light. It relies on an electrical isolation and optical coupling of two closely spaced Si nanowires that support optical Mie resonances5-7. When these resonators scatter light into the same free-space optical modes, a non-Hermitian coupling results that affords highly sensitive angle determination. By straightforward photocurrent measurements, we can independently quantify the stored optical energy in each nanowire and relate the difference in the stored energy between the wires to the incident angle of a light wave. We exploit this effect to fabricate a subwavelength angle-sensitive pixel with angular sensitivity, deltatheta=0.32°.
View details for PubMedID 30374161
Silicon single-photon avalanche diodes with nano-structured light trapping
2017; 8: 628
Silicon single-photon avalanche detectors are becoming increasingly significant in research and in practical applications due to their high signal-to-noise ratio, complementary metal oxide semiconductor compatibility, room temperature operation, and cost-effectiveness. However, there is a trade-off in current silicon single-photon avalanche detectors, especially in the near infrared regime. Thick-junction devices have decent photon detection efficiency but poor timing jitter, while thin-junction devices have good timing jitter but poor efficiency. Here, we demonstrate a light-trapping, thin-junction Si single-photon avalanche diode that breaks this trade-off, by diffracting the incident photons into the horizontal waveguide mode, thus significantly increasing the absorption length. The photon detection efficiency has a 2.5-fold improvement in the near infrared regime, while the timing jitter remains 25 ps. The result provides a practical and complementary metal oxide semiconductor compatible method to improve the performance of single-photon avalanche detectors, image sensor arrays, and silicon photomultipliers over a broad spectral range.The performance of silicon single-photon avalanche detectors is currently limited by the trade-off between photon detection efficiency and timing jitter. Here, the authors demonstrate how a CMOS-compatible, nanostructured, thin junction structure can make use of tailored light trapping to break this trade-off.
View details for PubMedID 28931815
- High-sensitivity silicon ultraviolet p plus -i-n avalanche photodiode using ultra-shallow boron gradient doping APPLIED PHYSICS LETTERS 2017; 111 (8)
Subwavelength Angle Sensing Photodetector
View details for Web of Science ID 000427296202462
- Simulation of a high-efficiency and low-jitter nanostructured silicon single-photon avalanche diode OPTICA 2015; 2 (11): 974-979
- Analog of superradiant emission in thermal emitters PHYSICAL REVIEW B 2015; 92 (2)