Abstract
Active control of thermal emission can be realized by modulating either the temperature or the thermal emissivity of an object. This talk will first introduce a new spectroscopic technique—Planck spectroscopy—that measures the spectral emissivity of an object by changing its temperature. Planck spectroscopy uses only a temperature-controlled stage and a detector, without any wavelength-selective components such as prisms, gratings, or interferometers. Then, this talk will describe our efforts to achieve ultrafast control of thermal emission via emissivity modulation. By using free-career dynamics in semiconductors, we generated thermal pulses on nanosecond and picosecond scales.
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