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Characterization of light emission from amorphous chalcogenide switches
1.B. T. Kolomiets, E. A. Lebedev, N. A. Rogachev, and V. Kh. Shpunt, Sov. Phys.‐Semicond. 6, 167 (1972).
2.G. C. Vezzoli, P. J. Walsh, P. J. Kisatsky, and L. W. Doremus, J. Appl. Phys. 45, 4534 (1974).
3.P. J. Walsh, S. Ishioka, and D. Adler, Appl. Phys. Lett. 33, 593 (1978).
4.We estimate the optical constants of Mo by matching, withing a 3% error, the ir reflectivity from 1 to 12 μm [AIP Handbook, 2nd ed. (American Institute of Physics, New York, 1979), Table 6g‐3] using a Drude formula for the complex index. AT 2.45 μm this yields and We take the index of a‐a‐ as 2.4, similar to glass The Mo ir reflectively will increase substantially in regions of thickness greater than 0.01 μm.
5.K. E. Peterson and D. Adler, J. Appl. Phys. 47, 256 (1975). The diameter of the “on” state filament, in their devices, is with I in amps, giving a diameter of 24 μm at the high current of 100 mA. The 0.4 power indicates that the current density and temperature rise in the filament increases only slightly with current.
6.For a coherent radiator this requires an emission diameter less than 30 μm.
7.K. E. Peterson and D. Adler, Appl. Phys. Lett. 27, 625 (1975). These authors estimate a maximum temperature rise of for well heat sink devices such as ours in the “on” state. While not negligible this temperature rise cannot obscure the fact that the output is not exponentially dependent upon actual device temperature.
8.An optical gain that depends on current density increases but slightly with “on” state current. However, optical feedback losses decrease with increasing current due to the increasing filament diameter. The larger diameter narrows the cone of reflected light and increases the area of gain over which this light can produce stimulated emission. When loss drops to gain a laser threshold exists, at the threshold Pore sizes greater than the filament area will not affect the threshold. The lack of detectable emission below threshold indicates that a long‐lived transition is involved.
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