Infrared dielectric function of polydimethylsiloxane and selective emission behavior
Abstract
The complex refractive index of polydimethylsiloxane (PDMS) is determined in the wavelength range between 2.5 μm and 16.7 μm. The parameters of a Drude-Lorentz oscillator model (with 15 oscillators) are extracted from Fourier transform infrared spectroscopy reflectance measurements made on both bulk PDMS and thin films of PDMS deposited on the gold coated silicon substrates. It is shown that thin films of PDMS atop gold exhibit selective emission in the 8 μm to 13 μm atmospheric transmittance window, which demonstrates that PDMS, especially due to its ease of deposition, may be a viable material for passive radiative cooling applications.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 08, 2016
- Source ID
- 10.1063/1.4961051
Entities
People
- Arvind Narayanaswamy
- Arvind Srinivasan
- Braden Czapla
- Jeff Mayo
Organizations
- Columbia University
- National Science Foundation
- Office of Naval Research