Dynamic modulation approach to topological photonics (Conference Presentation)

2016 ◽  
Author(s):  
Shanhui Fan ◽  
Luqi Yuan ◽  
Qian Lin ◽  
Meng Xiao
Keyword(s):  
Dynamic Modulation

scholarly journals Dynamic modulation of social influence by indirect reciprocity

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Joshua Zonca ◽  
Anna Folsø ◽  
Alessandra Sciutti
Keyword(s):  
Social Influence ◽  
Information Transmission ◽  
Social Group ◽  
Social Norm ◽  
Cooperative Behavior ◽  
Perceptual Task ◽  
Indirect Reciprocity ◽  
Dynamic Modulation ◽  
Human Partner ◽  
Good Reputation

AbstractIndirect reciprocity is a pervasive social norm that promotes human cooperation. Helping someone establishes a good reputation, increasing the probability of receiving help from others. Here we hypothesize that indirect reciprocity regulates not only cooperative behavior but also the exchange of opinions within a social group. In a novel interactive perceptual task (Experiment 1), we show that participants relied more on the judgments of an alleged human partner when a second alleged peer had been endorsing participants’ opinions. By doing so, participants did not take into account the reliability of their partners’ judgments and did not maximize behavioral accuracy and monetary reward. This effect declined when participants did not expect future interactions with their partners, suggesting the emergence of downstream mechanisms of reciprocity linked to the management of reputation. Importantly, all these effects disappeared when participants knew that the partners’ responses were computer-generated (Experiment 2). Our results suggest that, within a social group, individuals may weight others’ opinions through indirect reciprocity, highlighting the emergence of normative distortions in the process of information transmission among humans.

scholarly journals Dynamic modulation of visual and electrosensory gains for locomotor control

2016 ◽  
Vol 13 (118) ◽  
pp. 20160057 ◽  
Author(s):  
Erin E. Sutton ◽  
Alican Demir ◽  
Sarah A. Stamper ◽  
Eric S. Fortune ◽  
Noah J. Cowan
Keyword(s):  
Augmented Reality ◽  
Multisensory Integration ◽  
Sensorimotor Integration ◽  
Sensory Conflict ◽  
Dynamic Modulation ◽  
Sensory Inputs ◽  
Locomotor Control ◽  
Eigenmannia Virescens ◽  
Future Work ◽  
Perceptual Weights

Animal nervous systems resolve sensory conflict for the control of movement. For example, the glass knifefish, Eigenmannia virescens , relies on visual and electrosensory feedback as it swims to maintain position within a moving refuge. To study how signals from these two parallel sensory streams are used in refuge tracking, we constructed a novel augmented reality apparatus that enables the independent manipulation of visual and electrosensory cues to freely swimming fish ( n = 5). We evaluated the linearity of multisensory integration, the change to the relative perceptual weights given to vision and electrosense in relation to sensory salience, and the effect of the magnitude of sensory conflict on sensorimotor gain. First, we found that tracking behaviour obeys superposition of the sensory inputs, suggesting linear sensorimotor integration. In addition, fish rely more on vision when electrosensory salience is reduced, suggesting that fish dynamically alter sensorimotor gains in a manner consistent with Bayesian integration. However, the magnitude of sensory conflict did not significantly affect sensorimotor gain. These studies lay the theoretical and experimental groundwork for future work investigating multisensory control of locomotion.

scholarly journals Elongated-Hexagonal Photonic Crystal for Buffering, Sensing, and Modulation

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 809
Author(s):  
Sayed Elshahat ◽  
Israa Abood ◽  
Zixian Liang ◽  
Jihong Pei ◽  
Zhengbiao Ouyang
Keyword(s):  
Photonic Crystal ◽  
Irregular Waveguide ◽  
Optical Confinement ◽  
Physical Size ◽  
External Voltage ◽  
Dynamic Modulation ◽  
Highly Sensitive ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
Higher Sensitivity

A paradigm for high buffering performance with an essential fulfillment for sensing and modulation was set forth. Through substituting the fundamental two rows of air holes in an elongated hexagonal photonic crystal (E-PhC) by one row of the triangular gaps, the EPCW is molded to form an irregular waveguide. By properly adjusting the triangle dimension solitary, we fulfilled the lowest favorable value of the physical-size of each stored bit by about μ5.5510 μm. Besides, the EPCW is highly sensitive to refractive index (RI) perturbation attributed to the medium through infiltrating the triangular gaps inside the EPCW by microfluid with high RI sensitivity of about 379.87 nm/RIU. Furthermore, dynamic modulation can be achieved by applying external voltage and high electro-optical (EO) sensitivity is obtained of about 748.407 nm/RIU. The higher sensitivity is attributable to strong optical confinement in the waveguide region and enhanced light-matter interaction in the region of the microfluid triangular gaps inside the EPCW and conventional gaps (air holes). The EPCW structure enhances the interaction between the light and the sensing medium.

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