app.py

import streamlit as st
import numpy as np
import plotly.graph_objs as go

st.title("Electromagnetic Wave Simulation")

# Set up initial values
c = 3e8  # Speed of light (m/s)
lambda_ = 1e-9  # Wavelength (m)
omega = 2 * np.pi * c / lambda_  # Angular frequency
k = omega / c  # Wave number
E0 = 1  # Amplitude of electric field
B0 = E0 / c  # Amplitude of magnetic field
t = np.linspace(0, 1e-14, 1000)  # Time (s)
z = np.linspace(0, 1e-6, 100)  # Position (m)

# Calculate the electric and magnetic fields
E = E0 * np.sin(k * z - omega * t[:, np.newaxis])
B = B0 * np.sin(k * z - omega * t[:, np.newaxis])

# Create a 3D surface plot
fig = go.Figure(
    go.Surface(x=z, y=t, z=E.T, colorscale='Blues', showscale=False, name="Electric Field"),
    go.Surface(x=z, y=t, z=B.T, colorscale='Reds', showscale=False, name="Magnetic Field"),
)
fig.update_layout(
    title="Electromagnetic Wave Simulation",
    scene=dict(xaxis_title="Position (m)", yaxis_title="Time (s)", zaxis_title="Field Strength"),
    margin=dict(l=0, r=0, b=0, t=40),
    height=700,
)

# Display the plot
st.plotly_chart(fig, use_container_width=True)