Chiral All-Dielectric Metasurface Based on Elliptic Resonators with Circular Dichroism Behavior

Table 1

Main data related to the effects of the resonator ellipticity (a), orientation (b), and slot ellipticity (c), on the metasurface circular dichroism.

(a)

	Resonator ellipticity, τ
	1.33	1.66	2		2.33
Frequency bandwidth for |Δ| > 0.5	—	—	12.72–12.97	19.41–19.6	12.18–13.14	19.22–19.48
Bw (%)	—	—	1.9	0.9	7.5	1.3
Absorption for |Δ| > 0.5	—	—	0.52	0.73	0.9	0.76
Peak frequency, f (GHz)	—	—	12.85	19.53	12.62	19.32
Ellipticity angle, η (°)	—	—	15.42	−41	38.13	36.29

(b)

	Rotation angle, ϕ
	ϕ = 15°		ϕ = 25°		ϕ = 35°		ϕ = 45°
Frequency bandwidth for |Δ| > 0.5	12.05–12.82	17.2–17.63	12.18–13.14	19.22–19.48	12.59–13.21	19.42–19.66	19.83–20
Bw (%)	6.1	2.4	7.5	1.3	4.8	1.2	0.8
Absorption for |Δ| > 0.5	0.84	0.65	0.9	0.76	0.65	0.71	0.67
Peak frequency, f (GHz)	12.42	17.41	12.62	19.32	12.87	19.54	19.93
Ellipticity angle, η (°)	36.95	39.51	38.13	36.29	23.85	34.27	39.5

(c)

	Slot ellipticity, τs
	1.5		2		2.5		3
Frequency bandwidth for |Δ| > 0.5	14.83–15.3	15.92–17.45	15.21–15.58	16.82–18.76	15.56–15.69	17.54–18.92	16.35–16.37	18.1–18.62
Bw (%)	3.1	9.1	2.4	10.9	0.8	7.5	0.1	2.8
Absorption for |Δ| > 0.5	0.92	0.77	0.75	0.91	0.52	0.93	0.54	0.75
Peak frequency, f (GHz)	15.02	16.3	15.39	17.24	15.63	17.91	16.36	18.27
Ellipticity angle, η (°)	39.5	−44.44	33.6	−44.6	26.87	36.96	25.67	−21.1