Accession Number : ADA582320


Title :   Solid-State Quantum Refrigeration


Descriptive Note : Final rept. 1 Sep 2009-31 Aug 2012


Corporate Author : NORTHWESTERN UNIV EVANSTON IL


Personal Author(s) : Mohseni, Hooman


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a582320.pdf


Report Date : Mar 2013


Pagination or Media Count : 82


Abstract : In this project, we investigated a new method, adiabatic quantum cooling, to address issues involved in semiconductor laser cooling. We have developed the theoretical framework, as well as numerical modeling methods to design and model semiconductor devices. We also grew several epitaxial structures with record blue-shift, and process them into suspended ridge structures. A novel processing method is developed that can achieve record high thermal isolation. In order to measure temperature accurately, both micro-thermistor and micro-thermocouple devices were integrated on the chip. We also developed a thermoreflectance temperature mapping system with 300 nm resolution. Achieved temperature sensitivity was about 10 mK. We observe strong cooling component, although we have not achieve net cooling yet. Methods to increase the laser cooling beyond heating power are identified.


Descriptors :   *COOLING , *LASER APPLICATIONS , *SEMICONDUCTOR DEVICES , ADIABATIC CONDITIONS , CHIPS(ELECTRONICS) , MULTIPLE QUANTUM WELLS , PHOTOLUMINESCENCE , REFRIGERATION SYSTEMS , SEMICONDUCTORS , SOLID STATE ELECTRONICS , TEMPERATURE CONTROL , THERMISTORS , THERMOCOUPLES


Subject Categories : Solid State Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE