Chromophore Poling in Thin Films of Organic Glasses. 2. Two-Electrode Corona Discharge Setup

Abstract

Chromophore Poling in Thin Films of Organic Glasses. 2. Two-Electrode Corona Discharge Setup In Part 1 of the article we provided description of the corona discharge physics and overview of the methods used for corona poling in thin organic films. Subsequent sections describe comparatively simple technical methods for poling the organic nonlinear optical polymers using a two-electrode (point-to-plate or wire-to-plate) technique. The polarization build-up was studied by the DC positive corona method for poling the nonlinear optical (NLO) polymers. The experimental setup provides the corona discharge current from 0.5 μA up to 3 μA by applying 3 kV - 12 kV voltage to the corona electrode and makes possible selection among the types of corona electrodes (needle, multi-needle, wire, etc.). The results of experimental testing of the poling setup show that at fixed optimal operational parameters of poling - the sample orientation temperature and the discharge current - the corona charging of polymeric materials can successfully be performed applying the two-electrode technique. To study the dynamics of both poling and charge transport processes the three-electrode charging system - a corona triode - should be applied.

Poling Induced Mass Transport in Thin Polymer Films

“…For sample poling we used a computer controlled corona triode device, which allows us to monitor and control the poling conditions. The principal scheme of corona triode setup 17 is shown in Figure 1. During the corona poling, high voltage is applied to corona wires.…”

Chromophore Poling in Thin Films of Organic Glasses. 3. Setup for Corona Triode Discharge / Hromoforu Polarizēšana Plānās Organisko Stiklu Kārtiņās 3. Koronas Izlādes Triodes Ierīce

“…For poling NLO polymer films in the external electric field several techniques exist (e.g. [1,2]). One of them is poling with corona discharge.…”

“…In practice, charging with simple means (as applied in two-electrode systems) does not provide the efficiency required for NLO polymer poling [2,4]; therefore, two-electrode chargers were gradually replaced by the three-electrode ones (also called corona triodes). For better control of the poling process, a metal grid is introduced into the corona triode between the sample and a corona electrode.…”

FTIR investigation of molecular mobility in glassy epoxy-amine oligomers with azo-chromophores

“…The second harmonic generation (SHG) is observed in the medium. There are a lot of references concentrated on the investigation of the SHG in polymer matrix with NLO chromophores [1][2][3][4]. The great attention is given to the increasing of the relaxation stability of NLO response.…”