Table 1.

The properties of host materials for POF gratings.

Materials	Structure	n	Tg	Tm	α	dn/dT	Stress-Optic Coefficient	Moisture Absorption
			°C	°C	10−4 °C−1	10−4 °C−1	10−12 Pa−1	wt %
poly(methyl methacrylate) (PMMA)		1.49 [31]	104 [31]	160 [31]	0.68 [31]	−1.05 [31] −1.2 [31]	−4.5~−1.5 [31]	up to 2.0 [31]
polycarbonates (PC)		1.58 [31]	170 [31]	267 [31]	0.66 [31]	−1.07 [31] −1.1~−1.4 [31]	68 [31]	0.04 [31]
polystyrene (PS)		1.59 [31]	~90 [31]	240 [31]	0.7 [32]	−1.3 [33]	4.8 [31]	0.1–0.3 [31]
cyclic olefin copolymer (COC, TOPAS)		1.53 [31]	70–177 [31]	190–320 [31]	0.6 [31]	−1.0 [31]	4.0 [31]	0.01 [31]
amorphous fluoropolymer (CYTOP, Asahi Glass)		1.34 [31]	108 [31]	-	1.15–1.20 [31]	−0.97 [34]	6.5 [35]	<0.01 [35]
poly(ethyl methacrylate) (PEMA)		1.485 [36]	63 [36]	-	0.6 [37]	−1.1 [38]	-	0.5-2.0 [37]
poly(benzyl methacrylate) (PBzMA)		1.568 [39]	54 [39]	-	1.7 [40]	-	4.0 [40]	-
poly(butyl acrylate) (PBA)		1.47 [41]	−53 [41]	45 [42]	-	-	−0.45 [42]	-
poly(trifluroethyl ethacrylate) (PFMA)		1.418 [43]	69 [43]	51 [43]	-	-	-	-