Return to Research in the Microelectromagnetic Device Group


For further information contact Professor Dean Neikirk at
neikirk@mail.utexas.edu

For more details on this topic also see:

[1] D. P. Neikirk and D. B. Rutledge, "Self-Heated Thermocouples for Far-Infrared Detection," Applied Physics Letters, vol. 41, pp. 400-402, 1982.

[2] D. P. Neikirk, D. B. Rutledge, and W. Lam, "Far-Infrared Microbolometer Detectors," International Journal of Infrared and Millimeter Waves, vol. 5, pp. 245-277, 1984.

[3] D. P. Neikirk and D. B. Rutledge, "Air-Bridge Microbolometer for Far-Infrared Detection," Applied Physics Letters, vol. 44, pp. 153-155, 1984. (A surface micromachined bolometer, made long before the process was called that!)

[4] S. M. Wentworth and D. P. Neikirk, "Far Infrared Microbolometers made with Tellurium and Bismuth," Electronics Letters, vol. 25, pp. 1558-1560, 1989.

[5] S. Wentworth, PhD dissertation, "Far Infrared Microbolometer Detectors," The University of Texas at Austin, 1990.

[6] S. M. Wentworth and D. P. Neikirk, "A Transition Edge Microbolometer (TREMBOL) for Far-Infrared Detection,," SPIE Conference on Superconductivity Applications for Infrared and Microwave Devices, Orlando, FL, 1990.

[7] S. M. Wentworth and D. P. Neikirk, "Composite Microbolometers with Tellurium Detector Elements," IEEE Transactions on Microwave Theory and Techniques, vol. MTT-40, pp. 196-201, 1992.

[8] J. Lewis, PhD dissertation, "Far-Infrared and Sub-Millimeter Microbolometer Detectors," The University of Texas at Austin, 1994.

Micro-sensors - what happens when you make "classical" devices "small":
integrated bolometric radiation detectors


Dean P. Neikirk

Department of Electrical and Computer Engineering

The University of Texas at Austin

www: http://weewave.mer.utexas.edu

Micro-sensors - what happens when you make "classical" devices "small": integrated bolometric radiation detectors

Micro-Electromagnetic Device Group: Current Research Topics

Spectral Range of Common Electromagnetic Detectors

Detector Size Relative to Wavelength

Optimum Resistive Absorbers: large detectors

Optimum Resistive Loads:  small detectors

Quasi-Optical Detection System

Single versus Multi- Mode Antennas

Trade-offs: Small versus Large Thermal Detectors

Optimizing Responsivity: Thermal Impedance

Isothermal Profile into Substrate

Heat Conduction into Substrate

Heat Conduction Directly Through Device Leads

Fringe Heat Conduction into Antenna Leads

Optimizing Responsivity: Bias Current Limits

Optimizing alpha:  Superconducting Detector Strip

Impedance Matching: Composite Microbolometers

Composite Microbolometer

Layout of simulated devices

Temperature profiles for various substrates

Air-bridge Lithographic Technique

YBCO Composite Microbolometer

Responsivity Measurement

Noise Voltage

Noise Equivalent Power (NEP)

Behavior in near IR (1-10 microns)

Large Area Bolometer Designs

Free Carrier Absorption in Silicon

Free Carrier Absorption in Thin Silicon Films

Interference Effects in Moderately Absorbing Films

Impedance Matching using Backshorts

0.36 um Silicon Film with Mirror

Enhanced Absorption using "Resistive" Coating

Classical Devices Made Small