/// THz (Terahertz) optics simulation module.
///
/// Covers:
/// - THz generation: optical rectification and photoconductive antennas
/// - THz time-domain spectroscopy (THz-TDS)
/// - THz waveguide modes (parallel-plate, rectangular, circular)
/// - Drude model for metals and doped semiconductors at THz frequencies
/// - Atmospheric THz absorption from water-vapor resonances
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