We present a digital micromirror device（DMD） based superpixel method for focusing light through scattering media by modulating the complex field of incident light. Firstly, we numerically and experimentally investig...We present a digital micromirror device（DMD） based superpixel method for focusing light through scattering media by modulating the complex field of incident light. Firstly, we numerically and experimentally investigate focusing light through a scattering sample using the superpixel methods with different target complex fields.Then, single-point and multiple-point focusing experiments are performed using this superpixel-based complex modulation method. In our experiment, up to 71.5% relative enhancement is realized. The use of the DMDbased superpixel method for the control of the complex field of incident light opens an avenue to improve the enhancement of focusing light through scattering media.展开更多
The cross gain modulation, the cross phase modulation and their recovery time in the SOAs with the various lengths were experimentally investigated. It was found that these values strongly depended on the device length.
A simplified simulation method based on the FDTD technique that can handle active devices is proposed. This method well suits the electrical crosstalk analysis of multi-channel integrated, opto-electronic mixed module...A simplified simulation method based on the FDTD technique that can handle active devices is proposed. This method well suits the electrical crosstalk analysis of multi-channel integrated, opto-electronic mixed modules. We apply this method to an 8-channel integrated super-compact high-sensitivity optical module. The results show good agreement between simulations and measurements.展开更多
Event cameras detect intensity changes rather than absolute intensity,recording variations as a stream of“event.”Intensity reconstruction from these sparse events remains a significant challenge.Previous approaches ...Event cameras detect intensity changes rather than absolute intensity,recording variations as a stream of“event.”Intensity reconstruction from these sparse events remains a significant challenge.Previous approaches focused on transforming motion-induced events into videos or achieving intensity imaging for static scenes through modulation devices at the acquisition end.In this paper,we present inter-event interval microscopy(IEIM),a paradigm-shifting technique enabling static and dynamic fluorescence imaging through photon flux-to-temporal encoding,which integrates a pulse-light modulation device into a microscope equipped with an event camera.We also develop the inter-event interval(IEI)reconstruction algorithm for IEIM,which quantifies time intervals between consecutive events at each pixel.With a fixed threshold in the event camera,this time interval can directly encode intensity.The integration of pulse modulation enables IEIM to achieve static and dynamic fluorescence imaging with a fixed event camera.We evaluate the state-of-the-art performance of IEIM using simulated and real-world data under both static and dynamic scenes.We also demonstrate that IEIM achieves high-dynamic,high-speed imaging at 800 Hz in mimetic dynamic mice brain tissues.Furthermore,we show that IEIM enables imaging the movements of in vivo freshwater euglenae at 500 Hz.展开更多
基金Supported by the Natural Science Foundation of Beijing under Grant Nos 2162033 and 7182091the National Natural Science Foundation of China under Grant No 21627813
文摘We present a digital micromirror device（DMD） based superpixel method for focusing light through scattering media by modulating the complex field of incident light. Firstly, we numerically and experimentally investigate focusing light through a scattering sample using the superpixel methods with different target complex fields.Then, single-point and multiple-point focusing experiments are performed using this superpixel-based complex modulation method. In our experiment, up to 71.5% relative enhancement is realized. The use of the DMDbased superpixel method for the control of the complex field of incident light opens an avenue to improve the enhancement of focusing light through scattering media.
文摘The cross gain modulation, the cross phase modulation and their recovery time in the SOAs with the various lengths were experimentally investigated. It was found that these values strongly depended on the device length.
文摘A simplified simulation method based on the FDTD technique that can handle active devices is proposed. This method well suits the electrical crosstalk analysis of multi-channel integrated, opto-electronic mixed modules. We apply this method to an 8-channel integrated super-compact high-sensitivity optical module. The results show good agreement between simulations and measurements.
基金National Natural Science Foundation of China(62371006,62401477,U24B20140)Natural Science Foundation of Beijing Municipality(3242008).
文摘Event cameras detect intensity changes rather than absolute intensity,recording variations as a stream of“event.”Intensity reconstruction from these sparse events remains a significant challenge.Previous approaches focused on transforming motion-induced events into videos or achieving intensity imaging for static scenes through modulation devices at the acquisition end.In this paper,we present inter-event interval microscopy(IEIM),a paradigm-shifting technique enabling static and dynamic fluorescence imaging through photon flux-to-temporal encoding,which integrates a pulse-light modulation device into a microscope equipped with an event camera.We also develop the inter-event interval(IEI)reconstruction algorithm for IEIM,which quantifies time intervals between consecutive events at each pixel.With a fixed threshold in the event camera,this time interval can directly encode intensity.The integration of pulse modulation enables IEIM to achieve static and dynamic fluorescence imaging with a fixed event camera.We evaluate the state-of-the-art performance of IEIM using simulated and real-world data under both static and dynamic scenes.We also demonstrate that IEIM achieves high-dynamic,high-speed imaging at 800 Hz in mimetic dynamic mice brain tissues.Furthermore,we show that IEIM enables imaging the movements of in vivo freshwater euglenae at 500 Hz.
