Time for a policy of affirmative re-action
The chief aim of considering race in the college admissions process was to increase diversity and opportunity on our campuses, and while it wasn’t a perfect policy, it was still a resounding success.
Consider the data: In the 45 years that affirmative action was in effect, the percentage of degrees conferred to Black students rose from 8.3% to 13.6%, which exceeds the Black population ratio. For Hispanic students, it rocketed from 4.1% to 25%.
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Time-refraction optics with single cycle modulationWe present an experimental study of optical time-refraction caused by time-interfaces as short as a single optical cycle. Specifically, we study the propagation of a probe pulse through a sample undergoing a large refractive index change induced by an intense modulator pulse. In these systems, increasing the refractive index abruptly leads to time-refraction where the spectrum of all the waves propagating in the medium is red-shifted, and subsequently blue-shifted when the refractive index relaxes back to its original value. We observe these phenomena in the single-cycle regime. Moreover, by shortening the temporal width of the modulator to ∼5–6 fs, we observe that the rise time of the red-shift associated with time-refraction is proportionally shorter. The experiments are carried out in transparent conducting oxides acting as epsilon-near-zero materials. These observations raise multiple questions on the fundamental physics occurring within such ultrashort time frames, and open the way for experimenting with photonic time-crystals, generated by periodic ultrafast changes to the refractive index, in the near future.
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