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We report the first measurement of the zodiacal light (ZL) polarizationspectrum in the near-infrared between 0.8 and 1.8 $\mu$m. Using thelow-resolution spectrometer (LRS) on board the Cosmic Infrared BackgroundExperiment (CIBER), calibrated for absolute spectrophotometry andspectropolarimetry, we acquire long-slit polarization spectral images of thetotal diffuse sky brightness towards five fields. To extract the ZL spectrum,we subtract contribution of other diffuse radiation, such as the diffusegalactic light (DGL), the integrated star light (ISL), and the extragalacticbackground light (EBL). The measured ZL polarization spectrum shows littlewavelength dependence in the near-infrared and the degree of polarizationclearly varies as a function of the ecliptic coordinates and solar elongation.Among the observed fields, the North Ecliptic Pole shows the maximum degree ofpolarization of $\sim$ 20$\%$, which is consistent with an earlier observationfrom the Diffuse Infrared Background Experiment (DIRBE) aboard on the CosmicBackground Explorer (COBE). The measured degree of polarization and its solarelongation dependence are reproduced by the empirical scattering model in thevisible band and also by the Mie scattering model for large absorptiveparticles, while the Rayleigh scattering model is ruled out. All of our resultssuggest that the interplanetary dust is dominated by large particles.

Polarization spectrum of near infrared zodiacal light observed with CIBER